Southern Appalachians have been ridiculed since the country began. In fiction, they're usually depicted in a cartoonish manner. The region is poor, and very suspicious of outsiders, so there's a sort of 'us versus them' situation. They're easy to poke fun at.
Barbara KingsolverWhy does a person even get up in the morning? You have breakfast, you floss your teeth so you'll have healthy gums in your old age, and then you get in your car and drive down I-10 and die. Life is so stupid I can't stand it.
Barbara Kingsolver