My guess is that this attitude is where:
>In small town USA, the local culture usually is inferior.
Big cities often have people from many different cultures, including small towns, which is neat, and interesting things can happen when different perspectives collide, but, for the most part, cities just operate under the generic mass media American culture.
But, in my experience, people living in rural areas rely on their immediate neighbors for more than those living in larger developments. This is conducive to the development of a strong local culture, and outsiders who move in expecting the mass media American culture will likely not feel welcome.
Having lived a variety of places, I personally prefer the rural culture (at least here in Vermont), but I would not say big city culture is inferior...just different.
A tip: if you say a person's culture is inferior, they probably will not see you as worth listening to.