Why do some people find it funny to make other people uncomfortable?

By uncomfortable, I mean sharing humilating or shameful details about their past life, making fun of their insecurities, doing actions that clearly make the other uncomfortable (like touching them or kissing them), etc.

I don't doubt there are people that get a kick out of degrading others. But it doesn't feel it is the case for the majority of people who act like this. I believe for most people it is simply that they don't see their victims as human deserving of empathy and find the reactions of their victims funny.

Why do some people find it funny to make other people uncomfortable?
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