I like people who don't strive to always be nice. Better, I think, to know where you stand, to be communicating with someone being genuine, and to know if they seem to like you, if they're being nice to you, it's not out of some pussy morality obligation to do so, but because they want to. Fuck being nice to people who don't deserve it, why be fake for someone's feelings? are the freezsing winds of north supposed to just redirect themselves for the benefit of shivvering little bitches? harden up.
Most metalheads I've met are really no different to well, most -any music genre fans- I've met. (Hip-Hop'ers are perhaps more violent, but fuck they're all good sorts just the same)