Ye shall know them by their fruits

(Matthew 7:11-27 [KJV])
 [11] If ye then, being evil, know how to give good gifts unto your children, how much more shall your Father which is in heaven give good things to them that ask him?
 [12] Therefore all things whatsoever ye would that men should do to you, do ye even so to them: for this is the law and the prophets.
 [13] Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat:
 [14] Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it.
 [15] Beware of false prophets, which come to you in sheep’s clothing, but inwardly they are ravening wolves.
 [16] Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles?
 [17] Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit.
 [18] A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit.
 [19] Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
 [20] Wherefore by their fruits ye shall know them.
 [21] Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
 [22] Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
 [23] And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
 [24] Therefore whosoever heareth these sayings of mine, and doeth them, I will liken him unto a wise man, which built his house upon a rock:
 [25] And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell not: for it was founded upon a rock.
 [26] And every one that heareth these sayings of mine, and doeth them not, shall be likened unto a foolish man, which built his house upon the sand:
 [27] And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell: and great was the fall of it.

It says ye shall know them by their fruits. I have heard free grace preachers say that we cannot know if someone is saved except by their fruits, even though they claim that salvation is not of works and those that claim that you have to have works to be saved are lost.

So they themselves judge people by their fruits.

Like playing a first person shooter game and see who survives (I am not talking about doing something illegal here and I am not talking about hurting someone physically). Treating people online like lemmings, experimenting without regard for their personal well being. Doing this to supposed possible brothers.

Calling people work salvationists if they judge other people by their fruits but then they themselves judge those who listen to them by their fruits.

Hypocrites, ye generation of vipers.

King James Version (1769) with Strongs Numbers and Morphology  and CatchWords: Matthew Chapter 23
 [1] Then spake Jesus to the multitude, and to his disciples,
 [2] Saying, The scribes and the Pharisees sit in Moses’ seat:
 [3] All therefore whatsoever they bid you observe, that observe and do; but do not ye after their works: for they say, and do not.
 [4] For they bind heavy burdens and grievous to be borne, and lay them on men’s shoulders; but they themselves will not move them with one of their fingers.
 [5] But all their works they do for to be seen of men: they make broad their phylacteries, and enlarge the borders of their garments,
 [6] And love the uppermost rooms at feasts, and the chief seats in the synagogues,
 [7] And greetings in the markets, and to be called of men, Rabbi, Rabbi.
 [8] But be not ye called Rabbi: for one is your Master, even Christ; and all ye are brethren.
 [9] And call no man your father upon the earth: for one is your Father, which is in heaven.
 [10] Neither be ye called masters: for one is your Master, even Christ.
 [11] But he that is greatest among you shall be your servant.
 [12] And whosoever shall exalt himself shall be abased; and he that shall humble himself shall be exalted.
 [13] But woe unto you, scribes and Pharisees, hypocrites! for ye shut up the kingdom of heaven against men: for ye neither go in yourselves, neither suffer ye them that are entering to go in.
 [14] Woe unto you, scribes and Pharisees, hypocrites! for ye devour widows’ houses, and for a pretence make long prayer: therefore ye shall receive the greater damnation.
 [15] Woe unto you, scribes and Pharisees, hypocrites! for ye compass sea and land to make one proselyte, and when he is made, ye make him twofold more the child of hell than yourselves.
 [16] Woe unto you, ye blind guides, which say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, he is a debtor!
 [17] Ye fools and blind: for whether is greater, the gold, or the temple that sanctifieth the gold?
 [18] And, Whosoever shall swear by the altar, it is nothing; but whosoever sweareth by the gift that is upon it, he is guilty.
 [19] Ye fools and blind: for whether is greater, the gift, or the altar that sanctifieth the gift?
 [20] Whoso therefore shall swear by the altar, sweareth by it, and by all things thereon.
 [21] And whoso shall swear by the temple, sweareth by it, and by him that dwelleth therein.
 [22] And he that shall swear by heaven, sweareth by the throne of God, and by him that sitteth thereon.
 [23] Woe unto you, scribes and Pharisees, hypocrites! for ye pay tithe of mint and anise and cummin, and have omitted the weightier matters of the law, judgment, mercy, and faith: these ought ye to have done, and not to leave the other undone.
 [24] Ye blind guides, which strain at a gnat, and swallow a camel.
 [25] Woe unto you, scribes and Pharisees, hypocrites! for ye make clean the outside of the cup and of the platter, but within they are full of extortion and excess.
 [26] Thou blind Pharisee, cleanse first that which is within the cup and platter, that the outside of them may be clean also.
 [27] Woe unto you, scribes and Pharisees, hypocrites! for ye are like unto whited sepulchres, which indeed appear beautiful outward, but are within full of dead men’s bones, and of all uncleanness.
 [28] Even so ye also outwardly appear righteous unto men, but within ye are full of hypocrisy and iniquity.
 [29] Woe unto you, scribes and Pharisees, hypocrites! because ye build the tombs of the prophets, and garnish the sepulchres of the righteous,
 [30] And say, If we had been in the days of our fathers, we would not have been partakers with them in the blood of the prophets.
 [31] Wherefore ye be witnesses unto yourselves, that ye are the children of them which killed the prophets.
 [32] Fill ye up then the measure of your fathers.
 [33] Ye serpents, ye generation of vipers, how can ye escape the damnation of hell?
 [34] Wherefore, behold, I send unto you prophets, and wise men, and scribes: and some of them ye shall kill and crucify; and some of them shall ye scourge in your synagogues, and persecute them from city to city:
 [35] That upon you may come all the righteous blood shed upon the earth, from the blood of righteous Abel unto the blood of Zacharias son of Barachias, whom ye slew between the temple and the altar.
 [36] Verily I say unto you, All these things shall come upon this generation.
 [37] O Jerusalem, Jerusalem, thou that killest the prophets, and stonest them which are sent unto thee, how often would I have gathered thy children together, even as a hen gathereth her chickens under her wings, and ye would not!
 [38] Behold, your house is left unto you desolate.
 [39] For I say unto you, Ye shall not see me henceforth, till ye shall say, Blessed is he that cometh in the name of the Lord.

Well if you judge me by my fruit I can judge you by your fruits.

I could simply claim, I have no idea if you are saved or lost. I dont know you.