Probably D.C. but in all fairness none of these were from natives but transplants.
Just outright arrogance, superiority complexes and an utter disregard for social decorum.
Off the top of my head I've heard...
"Oh my god. That's crazy. How do you live in the Midwest? I could never live there."
"The women in this city [D.C.] are so ungodly ugly." Upon my disagreement I was promptly told I "could not possibly know what attractive people looked like because I lived in Ohio and New Jersey."
"This city [D.C.] is so boring. There's too many ugly and poor people."
That being said my best friend is a D.C. transplant and she is an amazing person