I didn't see the episode, nor do I watch the show anymore. I lost respect for Donald Trump after he threw the last Celebrity Apprentice to an undeserving candidate. God that angered me.
Anyways, i've seen a few clips of Gary. I think he's hilarious. I had no idea he suffered from a TBI. Doing a little research I found this:
"On December 4, 1988, Busey was severely injured in a motorcycle accident in which he was not wearing a helmet. His skull was fractured, and doctors feared he suffered permanent brain damage."
That explains why he seemed so out of it to me. That is very unfortunate. Knowing how a TBI can affect you and seeing someone made fun of for it would anger me too.
Just do what I do... Don't watch.