When I first saw this thread... I laughed!!!!!
I am from the south (though I grew up in Germany and now live in New England!!)
We moved to Boston five years ago, I have slowly stopped wearing make-up to the grocery store, quick trip to the mall, etc. I would never step out my parents front door in Madison, Mississippi without make-up on...

"You never know who you might run into!" My mother (who I might add always wears make-up) laughes at me!!!!
I am lucky, in that I get to fly home several times a year... I will get on the first plane (no direct flights to Jackson International Airport!) without make-up on... but before I land in Mississippi, I have my make-up bag out and apply my face!
I am sure this sounds a bit outlandish to those who are unfamiliar with the South, but for those that are.. I know you are laughing!!!!