In fairness to her, women tend to be socialized to do stupid stuff like that. Given a lifetime of such socialization, it can be very hard to come up with a better response on short notice.
I make remarks like the one above in part to help other women realize they do have other options. My experience has been that providing an example of more effective behavior tends to go a very long way towards empowering other people.
Many years ago, probably in my teens, I read a wonderful anecdotal story that I have retold many times on the internet:
In the eighties, a young woman was taking assertiveness training. The instructor was some Nazi-like drill seargent type of a woman. The course was teaching these women to yell at people and be extremely aggressive and pushy. At some point, it was the author's turn to yell and practice asserting herself. She told the instructor she didn't want to do that, she liked being nice to people. She was berated about how it is a tough world and she needed to learn to stand up for herself or people were going to walk all over her. She politely declined. Eventually the instructor moved on. She decided to quietly gather her things and leave. She didn't want to do this anymore. As she left, she overheard someone in the back row say to someone else "God, what a bitch."
So, yes, she should woman up, grow some bigger tits if necessary and wear her brass bustier to mixed gender events if that is what it takes.
I make remarks like the one above in part to help other women realize they do have other options. My experience has been that providing an example of more effective behavior tends to go a very long way towards empowering other people.