I lived in the Mount Kisco area.
Since you're asking about the attitude thing, please indulge me if I mention a few incidents.
Two happened at a camera store (not naming anyone in particular here, or the store) where I was a very regular customer, one who not only bought film in prodigious quantities, but who developed said film and had custom print work also done on occasion, and who purchased not a small number of cameras, both new and used 35mm SLRs (Nikons) and lenses from time to time.
The first time was when I was inspecting a good, used Nikon SLR and had some trouble removing the lens. One of their guys shouted out at me all the way from across the store to not break it. Heaven knows, and those guys did too, that I was not going to break a camera or lens. The camera obviously had a problem. When that jerk screamed at me, I blinked at him, and gingerly placed the camera back on the counter, and stepped away from it. I then told him that I knew what I was doing, that I wasn't breaking anything, and that his outburst was totally unacceptable. Then I said I was about ready to leave his store and never return again, and tell all my friends what just happened, unless he apologized to me. He did apologize.
Second time was in the same store, and I had just purchased some film, and the owner of the store sold it to me. At that moment, a horrendous crime was being reported on WCBS, newsradio 880, which was on and very audible, and I mentioned it to the owner, who simply ignored what I said, closed the register and went to the back of the store. Talk about being polite! He wasn't intentionally being rude, as far as I know, but just being himself, and it wasn't pleasant.
Third time, I was in the City, not far from the Ziegfeld, and for some reason a jerk said, unprovoked, "Where did they import you from?" Mind you, I was in a classic coat and tie. That jerk got a come back from yours truly, "I'm from ****** (place not far from Chappaqua) where are you from??" That good old New Yorker penchant for trying to make someone feel insignificant really did bother me, I admit.
Fourth time, at a printer's, in Brooklyn, of whom the proprietors were good friends. Said proprietor's brother, a New Yorker given to really salty language, when his brother was having some difficulty dealing with the delivery of a time-sensitive order, said "Gimme the phone" and then bellowed into the phone the following (I paraphrase), "You tell that g**d*** driver to stick that steel roller under his ***** and bounce up and down on it all the way here for 7 hours. I'm sure he won't forget to deliver it!!"
Jude, those four should be enough, at least for now.
Some time, I'll be happy to regale you with all the great, refined New Yorkers I know and how they too despise the crude, crass and offensive style of some of their confreres.
Respectfully,
Flex