Coney Island, New York. Dirty, expensive.
Lawrence MA, there's a lot of sketchy people who live there...it's wicked creepy
They call it the armpit of California. If you're looking for the bible belt but don't want to make the trip, just stop by Bakersfield or any neighboring cities in the central valley. Like Fresno! The heat is killer, there's not much to do, and you'll scratch your head at all the confederate flag bumper stickers while remembering that you're still in California.
Baltimore, MD, I've never seen that many RUDE people in one place.