Please, reopen question on "regionism". I improved it.
Professor Katie Wales, Chair of Modern English Language, School of English, University of Leeds invented the word.
"The media regularly and aggressively promote such loaded oppositions (e.g. Capitalist v. Communist) and they have done the most to promote the idea of a North-South divide. So, by analogy with terms like sexism and racism, bias against gender and race, I shall propose regionism, bias against a region".