I haven't lived everywhere, so that already disqualifies me from answering, but I'm feeling opinionated today.
I grew up in the Adirondacks, traveling a lot in New England. I have lived in the midwest the past 17 years, and traveled much of the rest of the country, although only a little in the south. Never lived on the west coast, but spent a decent amount of time visiting, almost the entire length. For me there's a fairly dramatic difference in culture between the northern and southern halves of California. One isn't superior to the other (although I have my own preference). Similarly, NYC is hardly representative of the east coast, and neither is Boston (both great places, and very different, although I have my strong preference there too - for Boston). Jackasses are everywhere, and so are some of the most astoundingly wonderful people you could ever meet.
The variety of terrain, features, climates, cultures, lifestyles, and approaches to how to live a fulfilling life... well, that's what makes it all interesting.
To answer the question a little better (maybe): sure, there are stereotypes about west coast vs. east coast, north vs. south, mid-west vs... anyway, they're not necessarily unfounded, as they certainly came from somewhere. That said, you're guaranteed to find exceptions absolutely everywhere, and it doesn't take any effort to find them.
imp:
Colorado, Utah, Wyoming, Montana, Idaho, etc. is where it's at :jump:
