Well, who do these homosexuals think they are to be so choosy about their sexual partners? It's completely bigoted for a gay man or a lesbian to reject someone simply because they are the opposite sex.
Tbh, that article is highly critical of the campsite that has said it is indeed for gay men only. Gay men are facing the same issues as lesbians. The power/threat dynamic is different, of course, but I'm sorry, no one should call themselves a decent sort if they try to make lesbians or gay men feel bad about saying no to the opposite sex. Every single excuse the people who do this have is an excuse for anti gay and anti lesbian bigotry.