David Allen Coe has always denied being Johnny Reb.
Actually the oracle that knows all (Wikipedia) has an entry on Johnny Reb aka Clifford Joseph "Pee Wee" Trahan who is not DAC.
Clicky
I find Johnny Reb amusing in the same way I find NWA's
Straight Outta Compton a very funny album. The difference was that I believe that Eazy E and Ice Cube were singing tongue-in-check and Johnny Reb was deadly serious.
There are rumors that old school country superstars Dave Dudley and Jerry Reed have covered Johnny Reb songs. One of my Johnny Reb mp3 sounds a lot like a young Jerry Reed.