Yea, anything south of NY is to your Yankee a** lol. Most Virginians consider the "south" to start from Fredericksburg or Richmond on down.
DC is probably one of the worst/meanest cities in the US. I've traveled all over the East Coast and have worked in Philly, NYC, Boston, upstate NY, Bmore, Pittsburgh, and down south and DC is, IMO, the worst city when it comes to relations with people in general. Very cliquish, snotty, people only care about themselves and getting ahead here. Plus... working with majority of gov't people just puts icing on this cake as the incompetence rolls deep.
NYC - Lots of people are friendly and will genuinely talk with you about something. Never really had a bad experience in NYC.