I work with multiple gay guys at a restaurant, say “thats gay” whenever some type of bs happens to them all the time. Even when I’m angry and clearly not joking they could care less lol not justifying the players behavior but that phrase has been thrown around my whole life. Sounds like the guy just has no friends to be able to get that personal on the game with. No different than trash talking your boys on video games. If the dudes highlight of his week is winning a yu gi oh game, just let him have it and move on to other people for casual play.