Perhaps because this forum isn't dedicated to one particular type of shooting or firearm is why you don't find "forum nazi's" here. Even though this forum is centered around MB's video productions we even occasionally mention those other shows....what's their names?
I'm registered on many other shooting boards, including several of the air gun forums. But I don't read them with any regularity. Primarily they are a resource when I have a particular question about that type of gun. RFC for rimfire questions. The Savage board for Savage questions, Walther for Walthers, S&W for..........etc.
Perhaps one of the more interesting boards that has a truly worldwide participation is Accurate Reloading. The name belies it's content as it has sub-groups for almost every topic from African big game to air guns. You have to be thoughtful about questions because you're posting to an audience that is not centered in the US. And responses sometimes open your eyes as to equipment and techniques that aren't common to the US.
http://accuratereloading.com/
OH and they have one whole group dedicated to cats....big and little.