Be careful who you call ugly in high school

I mostly do it because I don't give a flying fuck how other people feel. Maybe I'm a heartless sociopath.

Yes, you are a heartless psychopath, or at least an asshole.

Or maybe it's because I never, not even once, get offended by people calling me a name or whatever so I just assume others can take the same kind of hits. You know what they say what happens when you assume, eh?

Your implication is at least partially correct. You have made an ass of yourself.