Southern accents drive me crazy! I must drive them crazy. My exposure was to the likes of George Wallace and other segregationist public officials. Andie MacDowell, the actress and super model, became famous outside of fashion for a red neck version in a Calvin Klein jeans commercial. I would storm out of the room and not return to the commercial ended. It was painful for me. I met her in the course of real life. Her normal accent is one of the most refined in the South. I had no idea she was the Calvin Klein model. She took intensive speech lessons to acquire a Midwestern accent.
I studied broadcast speech for a few weeks. They want a Midwestern accent. The same is true of France. A Parisian accent is considered vulgar/ Being able to speak in a variety of accents is good for income purposes. The Eastern prep school accents are not considered the best. There are common elements that exist in country after country. I forget why they are chosen as preferable.
I never heard Barbara Walter's accent prob. b/c I share some characteristics.
The Civil War was a long time ago. I believe Southern accents are more acceptable than in my youth. Ebonics opened my eyes. I thought they were lazy. The teachers did not know how to teach them to pronounce the words. We called it housing project English. Clicking on wikiipedia links, I discovered that the students were speaking correctly for a Western African culture. I wonder how they felt constantly being corrected for what they heard at home and at church. My parents' speech was mocked by a teacher in front of the entire class.