It's call freezing them or kicking them until they change their class. You don't ban someone who doesn't want to do something. It isn't a rule; it's a personal preference. There has been countless threads about this crap.

I won't even bother placing a vote to get rid of fast zombies, and I don't even like fast zombies. It's just part of the game. And for the record, I've seen fast zombies fail on death star. It's called team work.