Seconded, and I don't have much of an accent at all (especially if I'm focusing on it). Even without that, east- and west-coast natives hear I'm from Texas and jump to the "stupid redneck" thing.
I just wanted to corroborate this. Im originally from up north and have lived in texas for over 30 years and my brain still interprets a southern accent as ignorant/lack of education. I still have cognitive dissonance when I hear rocket scientists from nasa (houston) with southern accents.