That's the most annoying thing about limousine liberal NYers.
Most of them speak the "unaccented" English of TV news talking heads. To them, a Noo Yawk accent is only one step above a Texas twang or a Mississippi drawl.
All accents except Peter Jennings' duckspeak, drawing-room British and Continental European are considered by them to be evidence of limited mental capacity.
I now speak this "unaccented" English because at the age of 13 I began attending an exclusive Jesuit school on the Upper East Side and my Noo Yawk accent was unacceptable in the debating society.
When I go back to Queens I usually "revert" to the accent of my youth, but I find that speaking in TV English is best for business.
Still, I love occasionally debating liberals as a Noo Yawkuh because they make embarrassing assumptions about my education that expose them as the twits they are.
In my experience, the accent is secondary. I went to grad school in NYC, and spoke unaccented English, after having lived abroad and spoken only German for several years. But since I was proud of having worked my way through school in West Germany on the assembly-line, my Ivy League profs -- socialist and conservative alike -- hated my guts, accent or no accent. The students who were accepted by the profs (and thus, the brown-noser student cliquies) informed you one way or another, bthat they came form rich families. As one girl who dressed in rags said, "My parents are rich, but we're not on speaking terms." Until then, she had seemed like a nice girl, notwithstanding the rags. She wasn't. She is now a tenured professor of "philosophy/women's studies." After two years, I walked away from it.
This resonates.