In 1975, we moved to Naperville. We were told pointedly "by the natives" that since we resided south of 75th, we were not "true Napervillians." In subsequent years, as Naperville rapidly grew, the "center of town," so to speak, shifted to south of 75th Street, a fact that the "natives" still refused to acknowledge.
Consequently, it is no surprise today that Naperville has been ranked among the nation's snobbiest cities. The more things change the more they are the same.