I went to flight school with a guy from there. He always talked about "Jersey." When he's say "Jersey" he'd do a little thing with his hand on his waist that he called a "swooby." I never could figure that stuff out.
No worries, arrogance borne of prejudice isn't easy to figure out. People like that want to feel better about themselves by denigrating someone else -- anyone will do.
I hope I never understand it. We should be glad we don't.