I'm not a woman, but I think I had an exchange with someone who projected like this before. I said something simple along the lines of how no one can change their sexuality- even Bis, and they went off and said I was passive-aggressive and then slagged off bisexuals a bit for good measure.

I don't know if it had anything to do with their desire to get married or anything because I didn't follow up on it, but I wouldn't be too surprised if they had some personal hangups that so leaked into their interactions with other people that they couldn't even hear what someone was actually saying. Like- the sounds/words would run through this "I'm talking to a bi now" filter that warped it beyond all recognition.

To some extent, I don't know how to deal with people who are not able to listen like that. Because I'm mostly the opposite, and for some reason I expect people to be the same, even though that is unfortunately not often the case. Some people may simply be biased against your demographic, have a chip on their shoulder, or just haven't developed the skill for hearing people out.

Usually I don't have any patience for that kind of behavior though. I have to look after my own mental health after all. If some random hostile leaves me with their emotional/ideological baggage I usually dump it immediately.