I'm sorry but I have to call you a liar. 4chan even has a board dedicated for gay people. Keep in mind this board was around way before any of the social change that's come about in the last 5 years. I used to frequent /gifs as a teenager, and there were were always tons of gay gifs. They were not 'paraded as gross or weird'. They were just gay. As a straight person, I can tell you that there were a lot more gross and weird straight gifs than there were gay ones (cough beastiality cough). I really don't know if this is just your interpretation or if you are a liar like I'm accusing you of being. But your experience certainly does not speak for all gay people. And I find it difficult to believe that someone who's gay would feel alienated like you claim.

/b/ used to actively mock heterosexual guys who were weirded out by all the gay porn and general naked dudes on there. I think they've suffered a certain amount of cultural drift/rot over the last few years though.