A bit related to this, so many times throughout my life when I've mentioned I'd like to be friends with, take up lost contact with or just mention a woman has a currently present woman reacted like "you know she has a boyfriend, right?", "I don't think you're her type" etc.
It makes sense that so many men have very few or no female friends, because they experience exactly that. It's like many women have decided that all men are incapable of being friendly with women without it being about sex or more than friends. We get scared of trying because it'll just be misinterpreted as wanting to fuck them.