What happened to being kind?

I’ve always wondered why it is that people have started being so selfish and rude to others?

When you are a kid, your parents likely taught you to be kind to others and yet people seem to enjoy being mean to others as we get older.

Why is this?

Maybe it’s the most stupidest question in the world but it’s often times sad to see how people - especially women who say vile and disgusting things about short men don’t reflect on their upbringing.

Perhaps it’s a sort of way for them to reason with life being unfair? I can’t really put my finger on it. Is it just the lack of compassion. I understand there are equally as many bad men and there are bad women but as a short man - I seem to encounter more and more of these people. Do they get to sleep at night knowing that they were rude and horrible to their fellow man?