There was a film, a long time ago I think, that said that Texas is just "Baja Oklahoma".
As far as states go, in my homestate of Indiana, the northerners would make fun of the southern part of the state. Now that I live in Michigan, I don't see much difference around Indiana. Or maybe it was that time living in Germany that made the differences around the US seem smaller?
Edit - In Michigan the Yoopers (Upper Peninsula) call the people in the Lower Peninsula "Trolls" as they live below the MacinaC Bridge.