I'm sure this will be elaborated on much more thoroughly in the hours/days to come, and I could see him walking it back a bit... But apparently several people have talked with Smith and he is "pissed" with the officiating during the game v Clemson, in particular the overturned Fumble return for TD.  

https://saturdaytradition.com/ohio-state-football/ohio-state-ad-gene-smi...

I thought it was bad reffing, with a Clemson lean, all game long... That was EASILY the most egregious and non-arguable bad-call.