>Well, what's stopping men from deadlifting 800lbs?
In a lot of cases, time and value. My brother has a squat of 500 and some change, and a 405 DL, but it's not worth it to him to improve those much further. He's foremost a football player and second a wrestler, and lifting is a means to those ends. He could likely hit an 800 DL if he focused on it, and heck, I might even be able to bump my shoddy 315x5 to 800 if I really worked at it, but that's flat out not an option for any woman.
The main reason I get so annoyed by this argument that "women can do basically anything a man does, if they weren't held back by socialization etc" is because I used to be a huge proponent of it, myself. Engaging in almost any type of sport or competitive activity quickly dispels you of that notion. While a female comp black belt could delete me from the face of the earth, I'd be very surprised if there's a female black belt alive who could beat even the best black belt in Columbus Ohio, and it's not like Cbus is a jiu jitsu mecca. We split sports by sex for a lot of reasons.