In all seriousness, I'm not rude to someone unless they're rude to me first.
The way I see it, it's my meme. Just like my house, if you come in, be respectful. I'll treat you the way that you treat me.
There are plenty of people that I can disagree with in a civil manner here. There are also some that if I just see their user name I know that we're going to have a bad time.