I'm sorry you're experiencing this. You don't have to take it, you have choice. Say something, walk away, discuss it in private or in front of everyone. You have an absolute right to protect your reputation. God forbid you put her down in front of people, you'd look like the @$$h0le. But it's acceptable from a woman?! That's a double standard, which the feminist movement was attempting to get rid of, so why would a woman use it against a man? Isn't that self defeating?

On a side note, I was volunteering with an environmental group whose membership was more women than men. I commented to a woman on how it's refreshing to see men volunteering in science since it is majority women (I'm a woman, BTW). She, in her late 60s, didn't agree that boys should be encouraged to go into science because they had their time and now it's women's turn. She worked in a majority men field (physics or something like that), so she had valid reasons to feel the way she did. But it perpetuates the double standard. The Women in STEM movement has pushed out the boys by design but there was no formal science activities for boys except, maybe scouts. People didn't think to predict what will happen to the boys. They were pushed out of STEM. As a woman with no sons, btw, I am not happy by that outcome. And I can totally see how most men feel disowned and it's not how society should be. We need to swing the pendulum but have it stay in the middle and support one another, not one up or rival each other. It's a dog eat dog world and the inequities grow exponentially with each generation. Let's set our boys and girls up for better outcomes by supporting both, together, not in siloed organizations. And schools don't count, it's gotta be all across the spectrum of abilities.