I have certainly seen 5/10 looking guys being treated appaulingly for going tor their looksmatched 5/10 woman, we all have, like a thief trying to break into a museum and steal the masterpiece. Like he is a criminal or something. Never seen the reverse. I never see women being challenged for wanting to date up in looks either.
The truth is women are the ones putting the pressure on each other.
They are very hypergamous, and this is a trait that is being overly empowered by our incredibly gynocentric culture, social media and dating apps. Because of this, they tend to suffer from apex fallacy: They all chase the best looking, tall, highest status guys and misinterpret these men's higher standards to be all men's standards, then pressure and even shame each other for not measuring up to these ideals because of how fierce the competition is to secure one of the high status Chad guys.
Body positivity is basically female anger / saltiness that they aren't a Stacey and attract a Chad (or keep him for an LTR after he pumps and dumps). It's all the crippling emotions that come with not being able to get a chad and the harsh reality that you might have to be with a healthy weight but otherwise unremarkable looking average joe.
In reality, men are much less harsh about women's appearance than women are of men's. Like I say, men tend to be only turned off by obesity/very overweightness in women. Men are fine with slim/normal weight 5'4 average looking women. Women are not fine with normal weight average looking 5'9 men. You want exclusivity for Chads and misery for betas. Why can't you admit this?
Men tend to have a far greater range of preferences for what we find attractive, while women usually tend to have strict requirements always for factors males have no control over; height, hair (bald), face shape (facial masculinity), secondary sexual charcteristics, frame size.