Apparently female friendships are bitchy (implied/said but not in those words) and so on 
I thought we were making friends too. Then I mention I'm friends with this woman who does x (she was talking about that subject so was relevant) and she starts.
AIBU? I asked her why she was writing off half the population (in politer ways) and the conversation carried on awkwardly as we both disagreed, but didn't get heated much. I can remember one woman at university saying something similar. I think dismissing being friends with people for their gender is
especially as she's a woman herself!