They just say stuff like this to mess with you, and to devalue masculinity. It's purely political. What's the point of being a woman if there aren't men? We are a social species. Men are as autistically productive as they are not because it gives them some kind of innate satisfaction, but because if they climb the hierarchy high enough they can get a QT 3.14 and dick them down over and over and over again, and maybe get some super hot chick pregnant and then have kids that can continue the cycle. Why do women diet, why do they exercise? Why do they study fashion? Women are more social than men, and generally love the attention they get both from other women, and from men. Every reasonably attractive women walks around with a few things men want, in other words they walk around with a series of constant "attention seeking devices," and like any social being they like positive attention, and they like it more as the value of the person giving it to them increases.
I'm actually not sexist, or at least not under any reasonable definition. Men and women are different. I think that in life women have more fun than men on average. There are drawbacks, but being able to constantly get positive attention from nearly half the population has it's perks. Would you want to be a woman if there were no men? Why would you want to go to engineering school? So that you can work for a major corporation, and maybe if you get trained really well you will engineer some contraption in such a way as to make some CEO marginally more wealthy? No one would be doing half the jobs that exist in our society if they didn't think that in some abstract way it lead to a spouse and a house to coom in. The house isn't enough by itself.
If you could be re-born tomorrow, as a thought experiment, would you be reborn into a life where if you don't really make something out of yourself and work till your smarter and tougher than most people, then no one will care about you? Or would you rather be born so that if you just take care of your body a lot of people in the previous category will want to invest the rest of their life and future into your success and provide for you? The average woman could if they made smart life choices marry an above average man both in terms of looks and career prospects, that simply isn't true for the average man. He needs to become above average if he wants a QT 3.14. If natural changes in the environment mean fewer men, I expect the ones that remain to be of higher quality, and if not we will engineer them, and if the engineering is too slow society will collapse and whatever big balled men are left will be impregnatin everryone out there.