For me it is Battletech fans. (do I really need to say "not all of them" because at this point in the thread I feel that it is already painfully obvious/redundant)
The newest official Mechwarrior game since 2002 is Mechwarrior: Online and the Battletech elitists are a fucking joke! They essentially defend the game and every single one of its fucking weaknesses and blatantly broken mechanics with vile vehementy then immediately do a 180 heal spin and decry all of its faster pace and un-battletech like gameplay mechanics that do not translate into realtime gameplay or will make it too niche to be remotely marketable.
Another is 60-75 percent of the MWO forum community which is a faceless douchebasket.
Would like some more Cheese with that Whine?
L2P-Single sentence statements to shutdown any complaint, no matter how legitimate, about the game.
Lastly a large portion of the community suffer from a group mentality over the proper way to play the game no matter how much it hurts others experiences, pseudo-intellectualism and pretentiousness through gross verbosity and through big words or literary concepts. They did not win the argument through logic, just big words, hypocrisy, and one getting hammered from every direction by the collective bucket.
If you are from the forums and are not at all like that or do not see it as often as I have then you do not need to tell me. Consider yourself OK and having experienced the better parts of the forum/game.