"The thing is, that's not a Southern accent. That's what Yankees think hick Southerners sound like. It's insulting."
You nailed it.
I have never heard Hollywood produce a believable Southern accent.
I recently watched Sean Penn in that movie where he played Huey Long and laughed all the way through it, at his stupid "so-called" Southern accent. I've lived in the South all my life and never heard anyone talk like that.
I also noticed Hillary yesterday trying to talk Southern, she failed miserably.