Astarion is a very cool character, I like him and his dialogues, but he definitively got gay vibes. He might be bisexual, but in my opinion he's more gay than anything else
dear, a flamboyant man is not more gay just because he is flamboyant, that is just a stereotype, is 2023... Theres no such a thing like more gay or straight, bi people are just bi people because they like both genders and bettween, no matter for what spectrum they feel more attraction. Being gay only means I like men, it doesnt have anything to do with my personality or expression.
Maybe you're just lacking life experience or you want to turn a blind eye deliberately.
Stereotypes exist for a reason, even in the year 2023. Many gay men have these effeminate, mincing vibes to them. Not all of course, I know some openly gay men from my gym, who aren't like that, but even they say, it's very frequent in the gay community.
That's why this stereotype still exists and that's also why you need to be completely ignorant to reality, if you don't feel the gay vibes of Astarion. (No offense intended from my side.) Even though Larian planed to design him as a bisexual character, he sends out very much gay vibes in my opinion.
Anyway enough board activity for me today, got to get some work finished and off my desk.