People look at another person for a few seconds or minutes and they make assumptions. They see a small nice part of someone's life then they assume his life is sunny & fluffy all the time. They see a small bad part of someone's life then they assume his life is all bad & ruined.
It's normal- to judge I mean. What's not normal is to believe all the assumptions are true.
We all judge. I judged- and was badly mistaken. Wounds heal, but I'm afraid they might leave scars.