However, the flaw I see in this person's perspective, having lived in both areas, is that Catholics in Georgia were persecuted by the Klu Klux Klan. This was not true in predominately Catholic South Louisiana.
A retired priest I knew in Georgia told me that you requirement to be a member of the Klu Klux Klan to be on the Atlanta Police force in the 1960's.
There was no violence with Catholics in Georgia because both white and black Catholics were persecuted by the KKK.
In terms of Archbishop Hallinan, I think he poked some fun at the KKK by doing some of his work of desegregation from the former office of the Grand Wizard of the KKK.
Were there public Catholic schools in the South?