No it has more to do with rigid gender roles. Women expect men to be strong, independent and (sexually) dominant. Being dominated by another man is a sign of weakness. A lot of women also do not leave any room for nuance. There is zero tolerance. Anything with a penis is bad, even transwomen. You could be bisexual with a strong preference for women, but you will still be put in the "100% gay exclusively for men" box.

Homophobia arises from seeing homosexuality as a threat to your heterosexuality. The LGBT people are coming after your coveted "straight" status and try to infect you with the "gay" virus which makes it harder to attract a woman.

Basically it's the male equivalent of being "deflowered".