True, but the central idea around which Southern society organized itself was white supremacy. The Northern society did not organize themselves so. They were racists, but the sine qua non of their society was not white supremacy.
Based on race relations of the past 100 years or so, I my OPINION, southerners of both races treat each other better than Northerner treat blacks, indicating that the Yankee feels superior by showing condescension and superior attitude. Again my opinion.