In my Christian walk - including the raising of my daughter and step-children - I have kept the distinction between judging the matter and judging the person.
For instance, I would say to one of the kids "that was a stupid thing to do." I would not say "you are stupid."
Likewise, I discern the fruits of someone speaking about Christ - and his doctrines - but I refrain from judging him personally. Christ's teaching here in the Sermon on the Mount (both from Matthew 7) deals with judgment first and then discernment:
Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves. Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles? Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit. A good tree cannot bring forth evil fruit, neither [can] a corrupt tree bring forth good fruit. Every tree that bringeth not forth good fruit is hewn down, and cast into the fire. Wherefore by their fruits ye shall know them. - Matthew 7:15-20
Know ye not that we shall judge angels? how much more things that pertain to this life? If then ye have judgments of things pertaining to this life, set them to judge who are least esteemed in the church.
I speak to your shame. Is it so, that there is not a wise man among you? no, not one that shall be able to judge between his brethren? But brother goeth to law with brother, and that before the unbelievers.
Now therefore there is utterly a fault among you, because ye go to law one with another. Why do ye not rather take wrong? why do ye not rather [suffer yourselves to] be defrauded? Nay, ye do wrong, and defraud, and that [your] brethren. - I Corinthians 6:1-8
And ye are puffed up, and have not rather mourned, that he that hath done this deed might be taken away from among you. For I verily, as absent in body, but present in spirit, have judged already, as though I were present, [concerning] him that hath so done this deed, In the name of our Lord Jesus Christ, when ye are gathered together, and my spirit, with the power of our Lord Jesus Christ, To deliver such an one unto Satan for the destruction of the flesh, that the spirit may be saved in the day of the Lord Jesus.
Your glorying [is] not good. Know ye not that a little leaven leaveneth the whole lump?
Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened.
For even Christ our passover is sacrificed for us: Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened [bread] of sincerity and truth. - I Cor 5:1-8
“God’s Name is I AM. “
HIS name is Jesus.