The reason the Lord is so stern about not judging one another is because judging involves interpreting motive or action.
We have many warnings about judging one another. Oh, how tempting it is to decide what another is thinking. Or feeling. I have heard people develop entire scenarios and justify their opinions because they may have seen the accused party grimace at something.
Be careful. If you are judging, it means that you are filling in the blanks. It means that you are assuming things that you do not know. It means that based on your one life and limited experience., you are interpreting components of another life. Those components are actually unknown to you.
The Bible says that only God sees the heart. Is that true, or are you adding yourself to the list? Of course not. You are humble before Him and you are willing to let Him who sees the heart decide what is there.
Soldier of The Cross, there is much to do. Many are hurting. Many are ill and many are alone. Children wander the streets in other countries and much of the world is hungry. Millions are without the Gospel.
You must not waste time setting yourself up as the, or a, judge of another.
Be about your Father's Business.