Overheard

Supergirl was at a birthday party at the home of her best friend, E,who happens to be the daughter of one of MY besties, OB-friend. E and Supergirl were happily playing doctor in the playroom with the other 2 girls present, all between 3 and 5. Really, it was just 'doctor' they were playing, not 'obstetrician'.
Enter: the only boy to attend the party, W.
E says to W,"You can't play doctor with us."
Supergirl says,"Yeah. Because you're a boy. So you can't play."
E says,"Yeah. Because boys can't be doctors."
Supergirl, "Nope. Only girls can be doctors."
Other girls look solemn and nod in agreement.
W looks rather nonplussed by this declaration.
E goes over to the toybox and gathers an armload of trucks, walks over to W, and dumps them in his lap. "Here. You can play with those."

I have to admit, as much as the mommies felt guilty that the girls were excluding W, not one of us stopped this little interaction. We all grew up in a very different era, and felt not-so-secretly proud of our little girls...in a twisted sort of way.