While that's one interpretation, there's Long been conflict in the US on the rural-urban axis - see Andrew Jackson's vision versus Alexander Hamilton's vision
Race is only useful in this sort of thing as a predictor of rough economic class, and even then it's less than useful. IOW, I don't think it's specifically race.
A better resource is "American Nations: A History of the Eleven Rival Regional Cultures of North America"
Indeed. Although I am not (currently) among the rural poor, I can't imagine ever trusting someone who openly refers to me or mine as "those people".
Or is there some deeper insult that I am missing due to not having experience of it?