It's not that people belive there is literally no difference. It's that people say the differences that do exist are irrelevant and/or aren't useful for making

It's not that people belive there is literally no difference. It's that people say the differences that do exist are irrelevant and/or aren't useful for making choices such as who might be better at what. If that's true, that these differences arent't predictive or actionable, then for practical purposes, there is "no difference". That's the crux of the argument -- are differences actionable? My hypothesis is that there are actionable differences in BOTH DIRECTIONS. Unfortunately a lot of assholes blew our ability to get to the bottom of which is which because they instead pretended to get to the bottom of things but really just rigged outcomes in favor of men. Now it's super hard to shed that baggage and actually try to make positive use of any actionable differences that may exist.