But then why do these stereotypes remain stable across generations?
Rational expectations equalibria are a thing. To take a somewhat exagerated example, if everyone thinks that girls suck at math, so no one teaches girls to do math, then no one will ever find out whether or not girls actually suck at math.
"Throwing like a girl" is a prime example of that sort of thing. Throwing like a girl turns out to be throwing like someone who's inexperienced with throwing.
If a boy throws like a girl, he's taught and/or shamed out of it as quickly as possible. If a girl throws like a girl, well, what did you expect?
I've phrased this in the present tense, but the culture's improved on the subject.
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