The rest of the state also has a proud tradition of hating public transit and attempting to defund MARTA (public rail & bus transit) in various ways. Punchline: no operational funding from state, but state historically limited how MARTA could spend its own sales tax revenue on operations. See https://en.wikipedia.org/wiki/Metropolitan_Atlanta_Rapid_Tra... and http://saportareport.com/a-marta-story-why-the-state-never-a... for some hilarious political hijinks.
Cobb County (immediately west of the city) also (a) is unwilling to contribute to MARTA, (b) has a terrible traffic problem, (c) is currently burning money to build an overpass over 30 miles of existing interstate to solve the problem forever (see: http://www.ajc.com/news/local/mile-reversible-toll-lane-what... ), & (d) refuses to even consider rail.
From wikipedia [1] Atlanta has the 3rd largest percentage, but it's 11th for total population. Admittedly those figures are for 2005, but I wouldn't expect Atlanta to make up that much on the top 3 in the last 10 years?
[1] https://en.wikipedia.org/wiki/LGBT_demographics_of_the_Unite...