Concern trolling, exactly. Trolls of this type among the crying Black Sails fans, too. Here's one by the username of Bubububak: "And no, I’m NOT a homophobe, which is something most people accuse us of… us who hate it. I do not care if he is or isn’t gay, as long as it’s not all he is. A guy with gay issues. That’s what they chose to make him into, this amazing, enigmatic, breathtaking character."

Yeah, keep trolling.

Your Teen Wolf tale reminds me sadly of Merlin fandom in season 2 when Gwen and Arthur started to be a couple. Suddenly you got all the complaints about how stronger a character Gwen had been in season 1 and how she now was "just a love interest". (Not that you can't critisize a lot of Merlin the show, including sometimes the writing for Gwen, but in this case, s2 gave her more, not less to do, and she was far more self assured and fighting for her opinions than in s1, so just maaaaaaayyybe the true objection was the part where one half of the big slash couple of the show fell for her.)