I've found that in the UAE they just don't want to speak to women, they just stamp your passport and nod you through
When I had a resident visa they always said "welcome home" which I thought, as an expat, was a nice touch. You're right they don't speak much when I'm traveling alone although a few have expressed pleasant surprise at my Arabic. As a blonde haired blue eyed European it's unexpected.
They're always very charming with DC and of course they always take you to front of queue when they're young.