There's a lot of that to go around.
In fact, a friend, we will call him "Matthew" does this in reverse. Matthew moved to NYC from Naperville, IL (a far-out suburb of Chicago) shortly after the 9/11 attacks. During one visit, I observed him telling his friends he is from Chicago. Not wanting to be an asshole, I didn't say anything and let him have his fun despite Naperville being as much like Chicago as Poughkeepsie is like New York. So, we met up with some of his friends and their friend. The friend-of-friends asked me how I know Matthew and Matthew butts in and says "I know him from when I lived in Chicago." As I always do, I clarified that my most recent home was in Evanston (across the city limits) and f-o-f asks Matthew what neighborhood he lived in. After a few awkward, silent minutes I said "Naperville!" Everyone laughed.
When Matthew went to the bathroom one of his friends mentioned he now knows why Matthew had never heard of his favorite Chicago restaurant.