I'm not sure about Mallett so I'll just take your word for it. Arkansas fans hate Nutt and probably find it funny that Nutt is in this situation, moreso than the kid that has the actual problem. Although, I can't speak for anyone but me.
Yeah. A UM alum I talk to who met Mallett once in Ann Arbor years ago found out he had a speech impediment and it just made it sound worse that he was speaking "gangster" as he called it. At first he thought the guy was dumb, but after talking to him, realized he actually had a speech impediment.
Now I'm all for poking fun at Mallett for his choices (acting black when he is not / speaking ebonics), but I have never and would never poke fun at something they can't control, like a medical condition. And those who would do so themselves are in fact weak and classless.
Superman never made any money
Saving the world from Solomon Grundy
And sometimes I despair the world will never see another man