Just because you know a Dale, Hank or Bill, doesn't necessarily mean you want to associate with them. Watching a show like KotH, when I myself not only live in the southern USA, but was born and raised here (and did NOT turn out as a redneck of any sort), is basically overkill. I see enough of the various southern cultures, and the various good and bad sub-cultures within those major groups. I don't want to watch a TV show about them, when I already see them first hand.
I liken the view to that of an Eskimo who doesn't just see "snow", but various forms of it. Within a culture, rednecks in this particular case, there are differences in the people belonging to that general group, and some of those you'd just rather not associate with in any way. This is the same as preferring to play in snow considered 'fresh powder' (or at least sticky enough to make good snowballs), and preferring NOT to play in muddy slush that seeps as quickly as possible into your shoes. Even with Hank representing the 'fine powder' example, KotH still, in my opinion, contains more muddy slush than anything else, and not just in characters, but the characters' circumstances within the show, the show origins (beavis and butthead), poor visual presentation, and so on.
That's about the best explanation I can give. Obviously, my opinion is different than some of yours, but we'll just have to agree to disagree in this matter.