Recently I told a friend 'You have a vengeful spirit' and she flinched and looked upset, like a nerve was clearly hit. Maybe she was just upset that I criticized her, but she's tough regardless, so I think I hit some sort of polr there. I felt really bad afterwards, I didn't mean to inflict pain so I tried to quickly cover it up with a compliment.
I notice I do that a lot in social situations. I'll surprisingly insult people. =/ It's really no wonder why I haven't had many friends over the years, well that and my ability to mistake teasing for something insulting when I don't wanna be bothered/not in the mood.