Judgment is a process of non-acceptance and criticism that allows us to feel better than others. This is always a bad idea because we lose the truth. Instead
Instead of working on ourselves, we look for a simplified way to feel better than those around us. That's why understanding the idea that IT'S NOT THAT SIMPLE is so important. Every person is a unique story, with hidden corners, and shaped by their unique life experiences. No one has the right to be judged in order to grow in their own eyes, because they will never have the full picture of another person's life.
SHUT UP! sounds pretty rude, but it's so important to be able to cover your mouth from criticism.
What's more important is who you have under your clothes, so WHUN UP!