.......... first of all
1. only Honey and Mori were implied to be gay before joining the club. The twins act like they're gay because it drawn in girls' attention, and the other two are just close friends.
2. there's no confirmation they're all gay. I mean, their affections for Haruhi may imply that they're bi, at least.
3. you hate the show for THAT??? It's one of my favorite animes.