Humility is no fun. In a recent article @Robert Lindsay and others noted how well people behave in areas where their spirits and souls are crushed like a soda can. But honestly, with Blacks it went too far. Using bullwhips to keep them in line and make them work? Also, Jim Crow was so ridiculous that courts had separate Bibles for swearing in a witness.
But I don’t think most Southern Whites were terrified of Blacks (they had them often as servants even in their home) as in thinking they had a disease. The main problem was they were afraid of Blacks they didn’t know and large numbers of Blacks, which is the case in the South.