Teach them while they're young

I was on the bus yesterday, and opposite me was a woman with a small girl in a pram, so the girl couldn't have been more than about two years old. The little girl keeps lifting her leg up and resting her foot on the pram seat, and the woman keeps going to her: "Put your leg down! I've told you to put your leg down! Everyone on the bus can see your knickers!" and then "You should have been a boy, not a girl. I'm sure you were meant to be a boy."
Nice. So, let's get the gender-stereotyping in as early as possible, and teach girls that there are things boys can and should do that they cannot and should not do. Also, that girls should be ashamed of their bodies and not show that they feel comfortable with them.
It had never before occurred to me that such things were that blatantly taught to little girls. Thank goodness my parents never told me I was behaving like a boy, and that was wrong.