I suspect in "liquorcycle" states like NC, getting pulled over on a 50cc is more common, just 'cause the cops are looking for DUI riders.
My experience in Nashville is that cops are too embarrassed to pull over scooters, in general... or like most other cagers, they simply don't notice "us." I've had cops pull up next to me at lights, roll down the window and ask MPG, top speed, etc., but usually in a dismissive, "I'm too macho to ride something like that" way. Even the one rookie cop who pulled me over on the Vino for not having a (not-required) tag asked a bunch of questions about it.
.