There are no Southerners who've never been north? No Westerners who've never been East?
I can't say if I met Northerners in school who hadn't been south to Florida or South Carolina or west to California or Nevada. Cross-country family trips were pretty common for the middle class. But I did know kids from the South who'd never seen snow.
When I lived in New Orleans there was a sudden freeze that created ice sickles. My neighbors, who had never seen ice outside of a glass tumbler turned their water hoses on all their shrubberies to create more and larger sickles - not knowing that they were destroying all their plants in the process.
Touche. Of course there are, but usually they are open to travelling to other parts of the country. The company I worked for recruited from colleges nationwide. Every year before the start of campus visits they held a meeting of recruiting team captains from the various schools. One of the team captains from the New York City area said that we should push the opportunity to work in the New York area to the students, and that they would all jump at the chance. It would be a big enticement to them in his opinion.
Perhaps so to some of the students. I hadn't the heart to tell him that the New York City area was mentioned far more than any other region in the country as a place they would not want for employment.
So, you are right. You can find parochialism anywhere. I've been to all 50 states. I prefer some over others, but something good can be found about each of them.