I am genuinely so annoyed by the male options? I still don't understand why everyone can't just be bi if they're going to keep the voice lines identical between genders anyway - as for the "oh it's not realistic tho" sweetie the game has dragons and magic in it, not to mention that every male character wants to get with female Byleth/every female character wants to get with male Byleth, we threw "realism" out the window a long time ago.
I think for me what hurts more than Alois and Gilbert being described as gay options despite you marrying a woman in their endings, is the fact that Sothis, Rhea, and Edelgard are all extremely story important characters regardless of route, and Edelgard, Dorothea, and Mercedes are generally pretty popular. Meanwhile the male option (yes, option, I refuse to acknowledge Alois or Gilbert they AREN'T options) is Linhardt, who A lot of people seem to adore as a character, but has zero story relevance as far as I am aware. Why can we not gay marry Dimitri and Claude at LEAST, both because they're story inportant (meaning each gender has three story relevant options) and, while I haven't played Claude's route from what we've been shown even from before release he's REALLY bi. And having played Blue Lions, Dimitri is SO gay for male Byleth. Then you've got cases like Sylvain and Felix, and Caspar and Linhardt, which are so gay, and yet three of the four aren't gay options, and it's never explicitly stated. I am tired of subtext at this point.
You say every character being bi would be "downright stupid" but...why though? Because it "wouldn't be realistic"? That's my point, if "realism" is a concern for someone regarding a game with magic and dragons, and where everyone of the opposite sex wants to get with the Avatar, how is every character being a bi option extreme? Its a way to make everyone gunning for anyone happy, since there's no restrictions - a lesbian can get with Bernadetta if she wants, or a bi guy can get with Caspar, both without having to play as an Avatar that's not their gender. Either making everyone a bi option, or doing something like Dragon Age Inquisition did, with several exclusively straight options, several exclusively gay options, and several bi options. The issue a lot of people have is that nothing is even remotely balanced - tons of purely straight options, zero purely gay options, and a very small and very uneven number of bi options.