Why does everyone believe everything Hollywood tells you to believe about the South?

Because its mostly true :p While Hollywood stretches the truth and mixes fact and fiction there is always a thread of truth behind every story. Nobody should make umptions about 100% of a population based on a few stories, but if there are enough stories then you of course have to start thinking hmmmm....... Problem I see with your question is YOU are making the umption that everyone feels this way......