I have a question for any who would answer: Do you know anyone who'd rather no one have any fun if they aren't having any? I learned how to game in high school despite a guy like that, and in nearly every large group of people trying to enjoy a game (MtG, D&D, etc) there's at least one. It's far worse when they are the ones running the game, I've had a LARP group self-destruct over that.
Since I've never found a way to easily deal with them other than kicking them out or ignoring them (Which doesn't really help), any tips?