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Girls are not meaningfully more fragile than boys, especially before puberty. Before puberty they're practically indistinguishable. If it weren't for long hair and the color pink none of us would know.

That's just something people tell themselves. Yes, we socialize boys not to cry. That doesn't mean boys are "stronger", it means that they have a pathological fear of being perceived as weak which will cause them sexual and relationship problems until the day they die.