Just de-lurking to respond to this...
sounds just like my friend. We were just pregnant together - just recently had our babies. I had 3 sons, she had 3 daughters. Before we knew what we were having, she started to say things about how awful boys are. One time, at yoga class, she went way too far. She started saying things like how boys are born "inherently violent" and just "kill each other, anyway." What the heck?? She went on about how men always start wars and are so violent and how she never wants one. Meanwhile, I'm thinking about my sweet, totally UN-violent little boys. I was so horrified that I didn't know what to say. I have 3 sweet, wonderful little boys who don't go a single day without telling me that I'm beautiful and that they love me. As I stood there listening to her, my mind was racing thinking about how if I had ds#4, she'd totally hate him. I don't know why I really cared, but at that moment I was wondering if her thoughts were only hers alone or if a lot of people felt that way about the male gender? All of the males that I know are loving, wonderful people. Why would she feel this way?
Fast forward....I had a girl after 3 boys and she had her fourth girl. now, she's saying things to me like "aren't girls wonderful?" Well, of course. But so are boys!! She asks if I'm having so much fun dressing up my daughter - yes, but I had just as much fun dressing my boys; in fact I find boy clothes more fun. Frankly, I really wish she would have had a little boy so that she would stop the comments. I know that her husband would have really like to have a son. Because now this "cover up" is going to continue and continue...
My assessment? I think she was secretly wanting a son and covering up those feelings by saying the (very hurtful) things that she did. I know that she was feeling pressure from her husband's side of the family to have a son and she was going overboard in trying to convince people that she didn't want one. I think the same for your friend, OP. I think that she secretly pines for a son and covers that up by stating the things that she does. But in the meantime, she makes herself look biased and unfair - quite unflattering. If she continues, I'd point out to her that she must like some males; afterall she obviously procreated with one. And would she want her daughter growing up to think boys are awful? Someday, her daughter may really like boys. Why not, instead, focus on teaching her daughter to love herself instead of to hate others?
Good luck.