Does it really matter? They can think what they like ... it shouldn't affect how we feel about ourselves.
You can't control how other people act or feel .. only how you allow them to affect you.
It doesn't matter who you are, everyone judges other people and not all judgements are negative!!! To judge someone or anything ,for that matter, is to form an opinion and everyone has them.
It makes them feel better about themselves
They have the ability and no one can stop them.... so I guess that gives them the "right"
It's human nature.