So no, that episode of Top Gear does not bring up any "good points" to draw legitimate conclusions about the American South. All it shows is that if you insult the average person enough, they'll get pissed off enough to deliver a few minutes of good footage. Meanwhile, back here in reality (not in TV land) -- if you visited down South you'd find that, given a broad sampling, Southerners are far kinder and warmer than us from New England. (p.s. I'm not from the South).
It gives me great concern that we as Americans assume so much truth from our 30 minute highlight reels.