I have not heard anyone say anything like this. It sounds like made-up hype to me.
Actually people in NYC area are very aware of where people "came from". I moved there from Ohio in '75. I went to the local store often and got to know the couple that owned it. They asked where my "people" were from. I said "Ohio". They said 'But where before that?" I said "America". I had never been asked such questions before so had no idea what it was they were looking for. This Jewish couple finally got that some of my ancestors were German. They were certain that I hated them.
I have no idea if it's changed but I was sure in shock.