he finally realized, good for him T___T Though Mizuho is a really, really nice guy. I hope he is able to support Rino, romantically or platonically depending on how the story plays out.
Where I'm from (UK) men will try to undermine other men to make the accusers feel better about themselves. This often takes the form of questioning their sexuality or outright hinting that they're gay
Regarding AFAB's wearing men's clothes, I've known transmen not passing even when doing that. Japan appears to be rather different than here