Guatemala is awesome. The countryside is beautiful and the people are descended from one of humanity’s major civilizations, the Mayans.

I realize OP is only half-serious, but they still come off as really ignorant.

I think the really wealthy old-money people would never say such a thing. Because such a thing just wouldn’t occur to them. And if someone said that to them, they’d just kind of smile and nod the same way they would to a toddler. Maybe say “Ah, yes, very good.” So that’s probably the best response.

But if I were writing a screenplay and had to come up with a one-liner I’d probably go with, “Just goes to show you can’t buy class.”