Lol, I have multiple diehard Vol friends who all grew up in the 80s and 90s with me, who all have the same "but I root for Duke in basketball" thing going on.
What really shocked me about some of them though was - even after Pearl brought UT to life, they still stuck with Duke. Oh, they'd watch Tennessee's games, but they cared about Duke more. Even now, with Barnes and UT being a serious name in the game, most of them are still "but I root for Duke in basketball." The weirdest thing. I can't understand it. I know how lean those years were, but it never occurred to me to just switch to another school like that.