I was a try-hard hipster in my 20s who, owing to poor socialization as a child, didn't understand that there's a big difference b/t what people say there virtue and ideology is, and what they actually do, and more importantly, how they broker that difference: your description absolutely matches my experience.
Enough women either refuse to date bisexual men or say things like "Well, maybe if they like girls more than boys". I met a bi independent brand designer in Portland whom relayed rather humorous stories of liberal, straight women's discomfort with his bisexuality.
Then there's the sect of women who'll suggest a man is gay as a insult, but when rebuked will play a rhetorical game like "What's wrong with being gay?"
I once went on a date with a data scientist and when I told her I was interested in getting a cat, either to be provocative or accidently revealing herself, she loudly proclaimed "That's gaaaaay" in the middle of a restaurent.
When I confronted her the next day about this statement, she said things like "I have gay friends", etc.
This notion that liberal women are absolutely receptive to queer men or anything they perceive as effeminate in men has real limits that are not actively investigated, and it has nothing to do with a subjectifying male gaze.