I only know two Tennessee-born Bama fans. And I'm related to both of them:
-- one a cousin, went to Bama, graduated from there. So it actually makes sense to me. I don't like it, but it makes sense.
-- the other, my wife's aunt, married a Bama fan later in life and lives in Bama ever since. This one makes sense, too, because she never followed any sports at all before marrying him, while he's as dyed-in-the-wool crimson as I am orange. He's actually the only Bama fan I know with whom I enjoy jawing about our teams. Good dude.
So yeah, don't know too many, but they both make sense and I doubt either of them are switching colors in their lifetime.
Which I respect.
Go Vols!