You have to understand it has nothing to do with Tua or his ability.
That's mostly coming from posters that hate Nick Saban, or Ohio St. fans that can't stand Alabama quarterbacks but will try to push any and every Buckeye quarterback that takes a snap, enters the Heisman race, and doesn't have NFL capabilities on you. Some people just don't like Alabama or guys that paint crosses on their face. Kev made reference to this a long time ago and it makes sense. Or some combination of all these.
I was told you just have to know your audience.