it almost like it stems from traditional gender roles where gay men are considered โneglectingโ their role as men in society (protector/provider of women), which results on the perception that we are outright selfish and fucked up. this also applies to trans women (who by homophobes are still seen as men).
on the other hand, women are traditionally seen as more passive and have their responsibility for a behavior put or attached to a man. hence a lesbian is seen more as โmisguidedโ wayward person rather than being seen as someone that is demonically corrupt. hence why corrective r happens a lot more to gay women than men.
so at the end: homophobia always stems from and in line with patriarchy system and misogyny