In general I'm polite person, even when I'm totally having a very bad day and my own mood is horrible, I can still be nice to people. But if I don't like a person, I can and will be a happy "rude polite" to them. But most people I don't, don't like me either. So, it's even.
Cause right now, I want nothing more then to say some very choice words to the people I'm stuck living with right now, but I can't. So I just leave them completely alone, and they hate that. I can hear them talk about me from the upstairs, so I know what they think of me. But it's best to be polite and the better person, then let yourself fall to their level.