Sounds like you have some first hand experience. From what I've observed of people, it seems petty tribalism, categorization, broad generalization, and extremism are among the most common psychological traps, not to mention an inability to pick one's battles. In the case of forums for video games that are E for everyone, I wouldn't put it past people to resort to hostile elitism as a coping mechanism for inadequacy problems. If they're really so desperate for validation that they need their version of a videogame to be the best then let them have it. It's best not to take their hostility personally, just remember they simply lack maturity. Don't let them snag you on the same traps, avoid correcting a fool and stay composed. There's nothing else you can do with them.