Hating it’s starting qb is long, time-honored tradition for Vols fans. Think about it.....I won’t go back as far as Bobby Scott, Dewey Warren, Condredge Holloway, Randy Wallace  or Jimmy Strearer,  because I can’t remember back that far, I was too young, but I’d bet money they got the same treatment.
But Alan Cockrell,  Jeff Francis, Randy Sanders, Andy Kelly, Sterling Hinton, Tee Martin, Erik Ainge, Casey Clausen, Jonathan Crompton, Tyler Bray, Justin Worley, Josh Dobbs....and now Jarrett Guarantano. All have been hated on, all have seen Vols fans demand they be benched/transfer, etc, etc. Hell, even Manning was hated on as a freshman, and even today many Vols fans, when discussing his Tennessee career, first thing they’ll bring up is “he never beat Florida”. I’m sure TRob got blasted too. 
Does JG deserve plenty of criticism for his play this year as a 4th year guy at Tennessee, yes. Some of his play has just been indefensible, no doubt. But look at the deranged, irrational crap so many spew, even when he does good things. It’s ridiculous.
Truth is, put Shrout and Maurer and Bailey and whoever else in there at QB in the coming years, they’re all gonna get the ire of the Vols fans who have this irrational obsession with “hating” whoever the present starting QB is at Tennessee.