It's interesting that you pick out relatively trivial traits to illustrate gender identities. There are plenty of male homebodies (and conversely gregarious extraverts) and adventurous women who hate pink. 

Perhaps that does illustrate the point. That 20% difference lies mostly in trivial traits, and a lot of that's a product of social expectations rather than biology. 

I don't buy McLaren's arguments, but I find the rebuttals equally weak. The problem is that everybody's gesticulating vigoroulsy about things that don't really exist. Neither I nor a lot of other people feel gender is a core part of their identity. any more than any other physical attribute can be. It's just an observation of a physical trait, and probably shouldn't be overinterpreted beyond the fact that it somewhat disrupts traditional social norms when people explore its meaning.