With all due respect, I have noooo idea what you are talking about.
I live in Chicagoland and never ever heard that expression or idea used to put down country folks...
Oh and my parents were from Iowa and son went to Iowa state—so I know and love Iowa.
I actually went to a trump Rally in Iowa, and I can tell you that he had nothing but fondness and respect for Iowans and their state.
I live in Texas and it’s common to hear it from people that live in cities.