That person who triggers you need psychological help. It's not normal to get a kick out of triggering other people. I'm not a dr, but that behavior is consistent with people on the antisocial spectrum. Unless they're a bully and want to "empower" themselves to cover up a flaw, but that still suggests something is going on in their life where they feel insecure and need help with being more confident.

I'm not saying their issue is an excuse, but it makes me wonder