Unless you live in a ridiculously small and homogenous country, it's likely that everyone reading this knows of areas that are greatly, even radically different from one another. America is pretty much the same. It's just that the loudmouths and idiots get the most press time because that's where the ratings are. A show or news story about "average Americans who just do their thing" isn't going to get the viewers.
Anyway, OP, good to see you enjoyed your time here in upstate NY. (And a pity you didn't get to see the snow that we usually get- some lovely areas up here, especially blanketed in white.) If international travel were cheaper and easier we'd probably have more moments of revelation like this across the board.
Myself, I've never been out of the country, but I have traveled from Ohio to Alabama, and I've seen the good and bad of both. Though I find it a good thing that this country (and the world) has so many differences- variety is the spice of life.