I wonder if it might not be a product of specificity and that exclusiveness thing again.
Us vs Them (non-gender specific.)
I, me, you, they, we... non-specific.
But if I want to talk about a group, it's the men of minas torath (though could it be as strong if we said "We of Minas Torath"?)
Women and girls aren't part of the club, btw, they're the ones that WE protect, we men of Minas Torath. True feminist thought tries to eliminate the protected status so that we are included (almost wrote "females," then "women," ahem) but language will always tell.
I'm just talking off the top of my head here. There's plenty of work in gender studies regarding language and how it shapes culture and perception. It's great the child has noticed this; good time to show her the language possibilities!