I want to make my best friend feel like shit
Is there a good reason why you would want your friend to feel that way?
I get off on his miserable life and it makes me happy to see him so upset.
It's wrong to intentionally want to make someone feel horrible about themselves. You should be trying to help make people feel better in their lives rather than upsetting them.
So we should only feel happy and ignore the negative things? Life would be boring if that happened.
That's not life. Negative things has to happen in order for use to grow and learn. Humans are evolutionary because of bad things always happening in our lifetime.