I was raised by a radical feminist and I'm always pointing out misogyny etc but I'm coming to the conclusion that boys and girls are broadly different.
My son is an outdoor runner abouter. I never was and neither was my sister, despite being dressed in very practical clothing.
Come to think of it my PhD holding wimmins studies mum didn't even take us to the park, that was a dad job until we were old enough to go ourselves, ditto the pool etc. My mum was too busy reading and talking on the phone.
I remember on holiday when DS was small they were offering a t-shirt painting activity with all the materials supplied. It looked so much fun but DS wouldn't hear of it, wouldn't even look at it. Of the kids sitting absorbed in the t-shirt decorating almost all of them were girls. I quite fancied it myself.
I see this played out everywhere, among families who absolutely do not push stereotypes. Meanwhile school actively encourage everyone to do everything. But they're still... boys and girls.