Which states qualify as culturally Southern?

[Atlas Has Shrugged]

All of them but Indiana.

[Atlas Has Shrugged]

Florida outside of Miami is definitively the South.

Aye.  I lived in Panama City (Tyndall AFB) for 2 years and it's quite rednecky.  Especially if you dare to drive inland for about 10 minutes.  Where I was at wasn't too bad because of the AFB and the "party" culture of PCB, but head north and it turned Deliverance right quick.

I spent the night in Quincy, Florida. It's right on the Alabama border and I had to remind myself several times that I wasn't in Alabama .

I'd expand the Miami qualification all the way up to Orlando, minus the Everglades/central southwest Florida areas.