Was she going to slap you because you never in any way made him gay in the actual books, taking zero risks/doing absolutely nothing for gay characters in literature, and only announcing your “authorial intent” afterwards for a cheap shot at looking like an ~ally~.
Gay people are just normal people. We are not told about any of the Hogwarts’ professors love lives other than Snape, and it would be completely out of character for Dumbledore to walk around telling everyone about his sexuality.
Did you want her to make him dress in glittery platform boots, a crop top, and decorate his office in rainbow flags to make it more obvious for you? Would that be enough of a stereotype to appease you people? Or what? Please tell me. I’d like to know how you think a gay character is supposed to be portrayed.
And did you miss the Grindelwald chapters in the ‘actual books’? Or was that also not obvious enough for you? Did Dumbledore need to whisper “always” wistfully in order for you to connect that he had romantic feelings for Grindelwald? Maybe you are American and need them to gaze longingly into each others eyes with awkward close ups of their fingers almost grazing each other that Hollywood thinks means ‘true love’.
It didn’t fit into his relationship to Harry to ever say “I’m gay”, and so it was not stated explicitly (you might have noticed the book was told from Harry Potter’s perspective).
The point is, though, that he is a homosexual, well respected, powerful, and very loved wizard— and his sexuality doesn’t matter because no one else thinks it matters. A.k.a. no one cares that he loves men, and that is wonderful.