He knew his south. His family. But he was born when some war veterans were still alive and his family had had active participants.
Faulkner is very popular as Canon literature but he doesn’t inform modern sentiments about slavery.
Those folks you are talking about who were influenced by the same currents Faulkner was writing about did exist as the Dixiecrats in the 50s and 60s. They lost. And now are mostly dead.
I don’t think poor southerners buy into some sort of antebellum utopian fantasy with Panama hats and mint juleps. Where they own people. It’s not like the south doesn’t have class conflict.
Racial conflict in the south is about power and fear and status. Ownership though, in all the years I was there, I never heard it brought up.