I think if you transfer in conference, you're going to catch some hate. That said, there are a few key differences between Hunter and if Grill went to another Big 12 school.
Hunter voluntarily left while he was viewed as being the star player for this years squad. Anyone losing their best player to a conference rival is going to sting a lot more and have the hate ramp up; if you cant see that then you're being obtuse. If Hunter went to Tennessee or Gonzaga then it would have stung less and a lot of people would have let it go.
Grill was kicked off the team and he wasn't going to be viewed as the star player for next years squad.
With all that said, I hope he goes somewhere like Wichita State where we don't have to play him.