Renly/Loras: lol, yes, there was. Incidentally, it is less explicit in the books, but nonetheless it is present, and GRRM has by now said that they were a couple several times, so I don't know how the fanboys could ignore that one, either.
(I've been out of GOT fandom for a while, because at the end my irritation at the more annoying fans prevailed, but I'm curious how they reacted to Oberyn Martell, who is pretty omnisexual, and actually got to snog a male prostitute. I hope a lot of them cried.)

And yes, that is so strange, how same sex couples only become uncomfortable once it is not two comely women. (Though I bet female slash fans disturb these guys, too. Nothing worse than women doing the same thing like men, only over men.)

Relationship drama "ruining the show": oh, that reminds me of concern trolling again. I'm watching Teen Wolf, and last season, one of the guys who is part of the most popular slash couple got a girlfriend. She was really popular before, but now people suddenly hated her, and got as far as claiming that she was reduced to being "just" a love interest. Did I mention that she only appeared two times in the previous season, and got much more development in the season where she was his girlfriend? Right. Got worse, too, because she is African-American. No racism here, though! Bigots, they come in all forms.