I don't have a problem with Dumbledore being gay but I have a problem with how JK Rowling chose to reveal it.
I was planning to reread all seven books in a row anyway, that's what I did. When book 5 came out, I read it immediately. Then I read 1-5 in order. When book 6 came out, I read it immediately, then I read 1-6 in order. A few weeks after Book 7 came out, Rowling announced that Albus Dumbledore was gay.
I paid attention to every seen with Dumbledore. There was tiny iota of hint to his sexuality in seven books.
If Rowling was trying to advance LGBT representation, she was being cowardly waiting till after all the books were out to do it.
I believe that after the last book in the series was published she was missing the constant media attention she was receiving up and brought up this minor controversy to get more attention.
He did dance with Madame Maxime but there was no romantic vibe in it like there was with Maxime and Hagrid.
There is only one tiny hint that Albus Dumbledore is that he is unmarried. But you never meet the spouse of any Hogwartz teacher. You never meet a son or daughter of any Hogwartz teacher. Flitwick, Snape, McGonagal, Hagrid, Trewlany and all the temporary Defense Against the Dark Arts teachers stay in Hogwartz Castle during Christmas vacation though the C-list Hogwartz teachers like Professor Vector seem to leave then.
The only Hogwartz teacher that is confirmed to be married is Lupin and he got married three years after he quit teaching and his friends had to twist his arm to pursue a romantic relationship.
I just kind of assumed that Hogwartz teachers are married to the job. I don't know about the traditions of British boarding schools, but in the United States before the 20th century, it was traditional that school marms quit teaching when they married. A small number chose to never marry and their kids were their students.
It was never stated out right in the books, but JK Rowling said that witches and wizards age a little bit slower than Muggles. McGonigal was in early seventies in book 1 and late seventies and book 7 but still spry. Dumbledore was about 150. 160 was about the maximum wizards tended to survive barring Nicholas Flemmel.
So Albus Dumbledore had a crush on a man during his early 20s. Then he beat him up his thirties and threw him jail. Then he was celibate for about 120 years. That's not gay. That's being an asexual.
But it doesn't really matter. In literature, if you don't write it, it didn't happen.
Like Shroedinger's cat who is neither dead nor alive, until you observe it. if you never bother covering the romantic proclivities of a characters they have no sexual orientation one way or the other.
One thing that bugged me is that in interviews Rowling talked about Fred and George Weasley as if they had distinct personalities. Later one loses an ear and the other dies. I don't remember which one.
Rowling talks about how difficult this was for because apparently the one that died was the gentler twin and the one lived was the more aggressive.
What?
In every book, in every movie, the twins are interchangeable. They finish each other's sentences. The only time they are seen apart is when took a girl to the ball and the other did not. Even when they were making out with Veela chicks at the wedding reception there were mentioned together.
They had the same classes, the same grades, as adults the same job. On the radio, they
still finished each other's sentences and they picked aliases related to each other.
Twice in book 1, the twins took each other's name for fun.
When Molly Weasley saw a boggart turn into the corpses of all her loved ones, (presumably she saw Ginny dead before Harry got to her). Ron, Percy, Bill, and Arthur all got a seperate corpse seen but when the boggart mimicked the dead twins they were dead together. Even in the subconscious fears of their own mother, the twins are interchangeable. WTM?
I have a good friend who has very young twins. I cannot tell them apart but their parents can, and go into great detail on how their personalities are different even though they are just learning to talk. Actually I haven't seen them in a year plus because of Covid. They are four now and are much better talkers. Perhaps I will be able to tell them apart once I can visit them again.
A long the lines of not mentioning things in your writing. I got tired of orphan heroes so my
protagonist Nilen the gnome has a huge family. Four siblings. He has six or seven aunts and uncles still alive and kicking. One of the aunts, Aunt Ariyas, I decided is a lesbian. I haven't figure out to work her into my first story, so I probably won't bring it up. Very few of Nilen's family is going to be in my novel but they will be mentioned in passing a fair lot because Nilen relies on the wisdom taught by his many family members, especially his Great Aunt Jomila who taught Nilen, his mother and aunt Ariyas about herbalism.
It's putting the cart before but if I come up with a sequel to
A Cobbler's Journey, Nilen might meetup with his lesbian aunt. His lesbian aunt is a priestess of the god Korus (Korus' priests and priestesses are called Stewards). Nilen the cobbler has little reason to deal with the Stewards of Korus, but the Nilen the hero might end up working with them. After his first adventure Nilen is going to join the Tenders of Mera and the Tenders and Stewards are allies, so once Nilen gets involved in ecclesiastical politics, he might have reason to reach out to his aunt or visa versa.
I have no doubt Rowling had backstory in her own mind how the twins were different, but she never put pen to paper on this, so it didn't happen.
Again I have 300,000 words of backstory for my fantasy setting and less than a 1000 words of story. Lets say I do finish a nice 50,000 word novel. Technically anything on my World Anvil page that doesn't make it into the novel is not canon. Things don't exist in the minds of your readers if your readers cannot read them.
Likewise, readers can see things that the author never intended which are very real in their mind even if they are not canon but that is a discussion for another day.
Going back to LGBT characters. I like the LGBT characters that Rick Riordan includes. I know it's a different media but I like the LGB characters in Brooklyn 99. Pretty much everywhere else I don't like them. Perhaps it helps that Greek and Roman mythology is full of gods and heroes acting in a non-binary way.
The two traps LGBT characters fall into into either is A) their sexuality is practically their
only noteworthy character trait or B) their sexuality is announced but it never affects the story in any way so it might as well not be mentioned.