Almost like the real world

This is a world similar to the real one, in which women have almost identical rights as men. However, due to some supernatural reason, all women got out of their minds and began to objectify and degrade themselves crazily.

You ask what the supernatural power is? Who cares?

Maybe it is something like the memetic contagion in the SCP Foundation Series. Or a mad scientist released a virus or special electromagnetic waves. Or you can make up your own version.