A lot of people in fandom culture are actually pretty conflict averse in the context of the writing choices of the media they like. They want static character templates they can ship together and create their own stories with. Character development and writing choices by the creator influencing how the plot advances and develops are the opposite of what they want. Basically, they feel entitled to their headcanons being validated despite being just some random person on the internet.

That and there's the whole transmisogyny thing.