Thing-a-me-Bob,

You must of watched a different telecast to what I did.
Sure he looked unhappy when he pulled into the pits. He shook his head and handed the bike to the crew without acknowledgment, BUT he walked to his seat sat down and took off his gloves and helmet and put them in their place.
Thats all I saw.
You can understand (eeerr, maybe you DONT want to)why he was upset, he likes to do his best and always rides to his best ability and when some thing beyond his control is not right he gets frustrated, thats how he is.

Also seeing you were watching a different telecast, you would not have heard the commentator saying how Casey uses "less" TC then any other rider out there.