Earlier quoted context omitted.
Well, sort of. There are large Asian communities in the suburbs between Buford Highway and Duluth, and the Asian population of Georgia Tech (around which most startups are based) is not insignificant. While racism is a problem in the South, thats not going to be an issue for hackers in the city. Quite the opposite: Atlanta is a diverse, tolerant place.
Atlanta is diverse and tolerant by the standards of Georgia, but it is a far cry from California or NYC. Just the perception of the entire South as an unfriendly place for non-white people will prevent many people from moving there. Plus, it is hard to attract immigrants - a lot of smart hacker immigrants would never move to a "red state".
I live here, and I've spent time in California, North Carolina, Ohio, all the places you mention and Atlanta is as tolerant as California. Midtown Atlanta is the most gay accepting place outside of West Hollywood or the Castro, and if you think there is a shortage of Asians here you've obviously never been here.
You're just projecting your own prejudices. You don't know anything about Atlanta.