Why is it OK for little girls to love dinosaurs, but not OK for little boys to love Barbie?

Over the weekend I read an interesting article in the Times magazine by Lori Duron, author of Raising My Rainbow: adventures in raising my fabulous, gender creative son.

I'll be honest, I was confused. The article talked about how concerned Lori and her husband were when their son started expressing a love for all toys usually favoured by girls at a young age. From the moment he saw his mom's old barbie doll he was hooked. When he started dressing up in girls clothes they were concerned.

The article, and presumably the book it stems from, talks about how Lori eventually discovered online (where else?) that there was a label she could give her son: gender creative, or gender non-conforming. Somehow having this label made it easier for them. Her worries about whether or not he was homosexual were eased by the discovery of this label.

Her son is 7.

Confused?

Well I am.

You see, regular readers will know that my younger daughter, Little Miss George, loves dinosaurs, plays with cars, is obsessed with Spider-man, Batman, the Teenage Mutant Ninya Turtles, knights and battles and swords. She actively steers away from 'girls' toys, and only occasionally, when she sweetly feels that she'd like to wear an outfit in her wardrobe that she knows we like (she's incredibly thoughtful) she will wear a flowery dress. Otherwise it's leggings or jeans and Marvel comic or dinosaur t-shirts. She even has a shirt for parties.

Her best friends are all boys.

Am I worried that she's a lesbian?