Patterson doesn't look pissed at all. The video's dark but he's definitely smiling about it while trying to act cool.
I don't know why people are saying he reacted that badly... he reacted the way a lot of people probably would in that situation. No one's gonna be happy they just had shaving cream thrown in their face, especially the first few seconds after it happens, but he didn't throw a tantrum or anything. He even reacted with some humor leaving the paper on his face, and I definitely saw him smiling towards the end there. I'm sure they were chuckling about that together two minutes after that video ended. I swear, people overly critique everything players do...
He wasn't jumping up and down in the video after his double double and after that cake was put onto his face he didn't laugh hysterically and give high 5's to everyone in the Rockets organisation. He wants to be traded to Miami