For god’s sake, if you do nothing else, please don’t be an asshole. Look at it this way – Do you really enjoy being reviled? I didn’t think so.
Let me go one step further: if you are about to say or do something designed to make someone else feel bad, just stop. It may make you feel good in the moment, but it’s not going to make you feel better in the long run.
Look, there’s a lot to be said for kindness. Force is an important tool also, but try to make your default empathy and treating others with respect.
You’ll find that life’s a lot more enjoyable if you do.