I suspect that some of these men – such as the man who insisted on using she/her pronouns for me – do so to mask their own internalized homophobia. After all, as evidenced by his continued chatting with me, his attraction did not stop upon finding out I am male. He could not square that attraction to a man with his own self-perception, though, so he rejected that reality. If I am really a woman, he is still straight. Denying reality enables him to avoid confronting a more complicated truth about himself than perhaps he is ready or even willing to accept.
I think this bit explains a lot of the behaviour of some trans women and many of their 'allies'.