I worked in NYC for 20+ years. I had New Yorkers tell me I was a New Yorker. But I would NEVER tell anyone I was a New Yorker because...well...I'm not a New Yorker.
At least Michigan Madonna, when she adopted a cheesy British accent, never told anyone she was from the U.K.
Wow...that's probably one of the nicest things anyone has ever said to me. :)