I've read the entire thread and here's what I think some of the posters who are labeling this homophobic are missing: a lot of what constitutes attraction is unexplainable and unquantifiable. I think people think that it's easy to look at society and say not attracted to bisexual men = homophobic.
But sexual attraction doesn't work like that. Why not BDSM = wife beater? If your DH likes blowjobs, it's because they like you in a submissive position? If you like open relationships, you are selfish?
See how it doesn't work when you just transpose for any other attribute?
I wouldn't be attracted to a bisexual guy because I find the thought of my partner being sexually active with men a sexual turn off. I don't think it makes him less manly but it would feel less special somehow. I think I like the idea of my partner being attracted to me as a woman. I really enjoy owning my sexuality as a woman. I just love having boobs and a womanly figure and I like the idea of a man thinking that it's not just cool and sexy but also a bit mysterious. Like we complete each other physically. It just wouldn't feel as special if he were attracted to other men.
I love men who love women's bodies exclusively. Honestly, I wouldn't be attracted to a man who had dated trans women either. But then a man whose past gfs were androgynous would also be a push for me.
Fundamentally, I think the idea that you need to just interrogate these preferences because "society" makes no sense. Relationships are overwhelming and hopefully life long. Sex is a deeply instinctual thing that is supposed to survive so many changes and crises. Realistically, being "open minded" is not a strong alternative to your own physical instincts.