What is your favorite and least favorite fandom that you're a part of?

I'm just specifically asking about the fandom (fan base) and not what you're actually a fan of. What is your favorite and why, and what is your least favorite and why?

For me, my favorite fandom I'm a part of is horror movies. I find that overwhelmingly, the fans are really nice and cool and from a huge variety of backgrounds. They're really fun to talk to and I love discussing horror movies with a new fan/friend.

As for my least favorite, it's hands down the Sims. It is SO bad, that I feel it is the second worst fandom period; at least that I'm familiar with. Sims fans are whiny, entitled, and ungrateful. As soon as a new pack is released it is immediately crapped on by the fans no matter WHAT it is. They are constantly asking for new things, and complaining when they get them that they aren't good enough. I truly adore the game, and wish I had some nice fans to talk about it with but it's pretty impossible to find. I can't imagine being involved in the creation of the game and seeing everyone just constantly crap all over everything you do, no matter what.