"Nerd." The way Mac says it makes it clear that while it's good-natured needling, it's backed by a legitimate mentality of men versus dudes-who-do-science. Or whatever else nerds do. The only reason this animosity isn't weaponized is because Mac's having a good time shooting the breeze with Sam.

"Single parent, that's rough." Mac shakes his head in overstated empathy. "Honestly, I don't know much about those states in the middle."

Or about most states, even those he's a lifelong resident of.