fellow bi girl here.. for starters these comments are weird asf, second i would absolutely be concerned about his beliefs being harmful to you and/or other people/groups you care about. too many straight men fetishize bi women and i’ve had an ex who said he “didn’t understand but was trying to” (he was not).
I totally get people associating anal with men being queer, like yeah that the most common instance of that kind of sex BUT it’s just stereotyped like that. It’s like calling clitoral stimulation gay because it’s not penetration or a woman trans for pegging a man or a lesbian taking a strap on actually straight because it’s a penis shape penetrating her. Like the only thing that actually makes someone gay is wanting sex with another man.
I actually do tell him when I disagree on any topic and actively hiding your opinions from your partner is not a good thing. Disagreeing on things isn’t a fear of mine but specific to the mindset of homosexuality (I’m bisexual) and feminism/toxic masculinity, I don’t want to marry someone who I disagree with fundamentally on things so important to me.