You could be right. Feminists are some bitter individuals...
I think the resentment is that they’re willing to drop the feminism (more willingly with passing year after 35), and it doesn’t do any good by that time. I don’t even consider many of these women “feminists”; at work they want promotions and pay but still want to leave at 4:30 every day (while the men toil until 6:30). They (and the men who won’t marry them) are often just overgrown children; this is only news because the women have had enough (and the men don’t care either way).