I prefer it to be faked, even if I can see right through it. I'm kind and polite around people I dislike because I'd prefer to be treated nice in kind. If someone has a problem with me, though, I'd still rather know what the problem is. It's not contradictory either. I can be polite and say "I dislike you as of late because you X" and I won't have any hard feelings. It's better than "Fuck you, I hate everything about you, go kill yourself."