Jesus answers this.
And Jesus does not contradict 1 John 1:8. Correct
John said if a person claims to have no sin, he is a liar. Is that judging or stating a fact?
John says if we claim to have fellowship with Him and walk in darkness, we lie. Is that judging or stating a fact?
John said whoever practices sin is of the devil. Judging or stating a fact?
Not judging, but stating facts in ALL cases. So the accusation that I am judging has no truth to it.