The whole creativity/masculinity thing is still buzzing around in my head, and I know that this has been discussed ad nauseum, but I don't know if I've ever read an adequate explanation.
Why are boys taught to hate girls? It's kinda like a prerequisite for being accepted into the brotherhood, that boys must hate girls before they reach puberty and the hormones kick in. We're bombarded with images that reinforce this notion, and people boys encounter gleefully assume it and reward them for it.
And then when puberty hits, it's lust we're supposed to feel. And then comes love. But maybe a kernel of that early hate, that early disreguard and dismissive attitude is still there, like other childhood ideas and lessons that stick and follow a person throughout life and are almost impossible to extinguish. Psych professors in college told me that the stuff that happens to a child during his first 5-6 years of life is formative stuff, and incredibly difficult to undo.
Why do we do this to our kids?
By the way, I've always been an outsider, and never got, or accepted the "hate" of girls when I was a kid. But I didn't play with them much (yeah, I realize how loaded that statement is), because despite the fact that I didn't get the whole deal, and liked girls, society wouldn't let me play with them -- from my parents to my classmates to the world around me, they all frowned upon my fraternization with the weaker sex. It was like, hanging out with girls would give me cooties!
My favorite book as a kid was Harriet the Spy (which, I assume, was probably the favorite book of many writers). As I look back on it, I realize the author made it clear to us that Harriet was a tomboy, which, I guess, made it possible for us boys to accept her as not as icky as other girls...she would never be part of the brotherhood, but if there were no real boys to play with...), and probably a lesbian (okay, I'm having fun here writing the sequel in my mind), so the fact that she acted like a boy gave her crossover appeal on the playground. I think that was the only book, as a child, that I read that featured a strong, female (girl) character. And I was a voracious reader.
Some lines, I was reminded on a nearly daily basis, should never be crossed: I could read The Hardy Boys, but get caught reading Nancy Drew? Egads!