I have issues with her deciding after the fact, to do the hip and inclusive thing and tab Dumbledore a queer.
I think Rowling made Dumbledore a homosexual from the beginning. She always had back stories on characters, and those back stories were frequently revealed as the plots went on. In looking back through the books, there are numerous clues to Dumbledore's sexual preferences, and I think Dumbledore's homosexuality actually drove the entire series.
Dumbledore was sexually attracted, IMHO, to Gellert Grindelwald, Tom Riddle, Sirius Black and Harry. His desires for Harry weren't consummated because of his advanced age (and, of course, because it would have tanked sales.) Several clues to his sexual attraction for Harry were given. He burst into tears upon finding out that Harry declared himself to be "Dumbledore's man, through and through." He told Harry he hadn't revealed his true destiny because he "loved him too much." During the entire seventh book, one of the sub-plots was Harry trying to figure out how Dumbledore really felt about him.
As to the other characters I believe Dumbledore was sexually attracted to, Dumbledore stayed locked up in his room with Grindelwald when they were teenagers. He allowed Tom Riddle to frame Hagrid for the death of Moaning Myrtle, although he knew, or strongly suspected, that Riddle was behind the death. When Sirius came back, he did not check the Shrieking Shack as a hiding place, although he had set the place up as a hiding place, and knew full well that there was a path directly into Hogwarts. Dumbledore declined to pursue Grindelwald, Riddle, and Sirius, I believe, because he had been sexually attracted to each of them.
In one sense, the Rowling books were sexually almost neuter. There are no sex scenes beyond a passionate kiss, and almost all attractions are portrayed as a romantic love. On another level, there are references to very perverse sexual relations. Hagrid's father was normal size, his mother was a twenty foot tall giant. Professor Flitwick is half Goblin. Dumbledore's brother was arrested for performing inappropriate spells on a goat.
In the sequence describing Tom Riddle's mother, I think there are undertones of sexual abuse by both her father and brother. Rowling is very deceptive. There are a lot of undercurrents in the books.
I was annoyed with Dumbledore being gay... I’d never thought of him in a sexual context. He was just a mysterious powerful wizard, a force for good and a wonderful headmaster.
In the later books she made him a little more complicated and looking back, I think she intended that his brief bout of madness as a youth was connected to a passion he felt for another male, which led to lifelong regret.
I think he became asexual after that, at least in practice.
that bugged me too...