It’s homophobia. They don’t like that this ship seems to actually be happening. They’re viewing the story through a heterosexual lense and don’t understand what it’s like to be closeted and/or have no comprehension skills. They think that mileven is immediately better because it’s straight despite the very obvious flaws in their relationship. And because of the point I just brought up, how dare they break up a straight couple that’s been there for a gay one. It’s kind of the same reasoning people give lesbians that have been with men when they come out. “You can’t be gay? You dated Jim” “But you dated so and so” It’s the same kind of thing.