One key issue in the world is that we don't know people.
We judge a person by race, gender, occupation or whatever we see or hear about them that we don’t like or sometimes feel we do like. Judgement is not always negative...
That said, it is negative if that judgement is not founded in fact! I myself am guilty of having falsely judged and have been a victim of false judgement. When we judge without the benefit of taking time to truly know a person, we are doing both that person and ourselves an injustice.
Take time to get to know a person before judging them. Better yet, don’t judge anyone at all!
Live good with people!