Probably because Dr. Pepper was invented before Coca-Cola, but both are from the south. Dr. Pepper in Waco, and Coke in Atlanta. Having been born and raised here in the Atlanta area, I can say that this is true. Everyone in my family will use the term 'Coke' as a generalization, but a Dr. Pepper is always called specifically by name.
Now, one exception to the generalization use of 'Coke' would be 'RC Cola'. This is also a southern soft drink. (Columbus, Ga.) This company, BTW, came out with the first diet drink .... Diet-Rite.
Two of my favorite snacks .......A bottle (glass, of course) of Coke, with a package of salted peanuts poured into it. Second only to that is an RC Cola and a Moonpie.
he usually consumes a 1/2 case per football GAME!
not even i, who is a "DP-addict", drink that much in 3 hours!
free dixie,sw