But San Francisco is also 33.3% Asian and over 15% Hispanic. The white to non-white percentages are very close between both locations. And while the story of Asian Americans in SF is not the same as Black Americans in the South, it was hardly a picnic for them (for one example, Angel island).
Probably because Columbus GA is 45% black and San Francisco is only 6.4% black. Hard to have black/white tension when one of those groups comprises such a small percent of total population.