He does look a bit pissed off, but there is a moist look about the eyes - perhaps he's too overcome with emotion to clap and cheer. Who knows? I think that if he had been really angry not to have won he would have hid his feelings more and gone through the pretence, like show biz people tend to do. Lord knows they must go to enough first nights to know how to pay false compliments convincingly.
But he just sat there looking sort of sad. Maybe he's worrying about things, the girlfriend, whether he's been dumped, does he really want to be with Chantelle, etc. etc.