Typical ignorance and arrogance. I've experienced the same - when my employer sold her business to a large corporation in New York. The condescension of the New Yorkers toward us Southerners was so obvious. In time we've come to realize that those folks up north aren't very smart.
Nobody, and I mean nobody, sounds more bloody ignorant than someone with a New Yawk accent, particularly if they're from Brooklyn.
"Hey Jo-ee, cum-awn ova heeya and grab some 'o dis, babeee!"
New Yawkers take classes to learn how to not talk like that.
Generally...they don't have much in the way of manners either, bless their hearts.