It’s like when you discuss music with a metalhead, it’s not that you just don’t feel anything when you listen to metal, and you don’t consider complex polyrhythms to just be objectively “better” because they’re harder to play. It’s that your music sucks ass and if it’s not the right kind of metal it also sucks ass.
Linux can play most games, but if you like playing games that Linux doesn’t play then those games suck and you shouldn’t want to play them. That’s their perspective.
Why do you want to play Fortnite or CoD warzone? Don’t you know kernel level anticheat is a rOoTkiT?!? (As if they could even define such a thing without resorting to just pointing at shit they don’t like and twisting the definition like a Baptist preacher trying to create theology.)
You can’t win with these types of people, Linux can play games! And if it can’t it’s YOUR FAULT FOR NOT EXCLUSIVELY PLAYING GAMES THAT LINUX CAN PLAY.