Kids are influenced by their parents, their teachers, and their peers. It's no coincidence that kids raised in some environments are more likely to segregate themselves into gendered groups than others.
I was raised in a household without a particularly strong emphasis on gender, but in a society and in a community with a moderate emphasis on it, so I was happy enough to read books with female protagonists, as long as the subjects weren't overly "girly." It's incomprehensible to me to be unwilling to read books with female protagonists, but I understand how it can happen.
Please also note that while you're likely able to gather my position from context, I'm not actually making a claim about whether gender associations are good or bad, just about where they come from.
Is that clearer? I'm genuinely trying to address your complaint, so I'm happy to elaborate or clarify further.
Kids are a product of their surroundings, corrupt or not. Have you never encountered kids with extremely rigid opinions of things they could impossibly have reached on their own?
> are you saying that the perfect representation of humanity is incorrect in some way ?
Incorrect presupposition.
At what age? The context is kids at the age they start reading. If your experience is anything close to mine, you're describing teens.