I understand it's your server, and you can do what you want on it, however, I think it's silly to assume you can judge intelligence by games they like.
I must admit, I do wince when "Mastercheif1337" connects to my server.
But really, Fox, you can't honestly imagine someone with the name "ULTRAKOOLSPARTENDUDE" makes you think, "Oh wow, this guy must be really smart! :D," in a literal sense.
I do agree with Amade, but my actions aren't as harsh. Then again, I really only pay notice if I'm not busy/out of it, which I am most of the time.