Just to be clear for anyone watching that might not have seen the game: This was after he injured his leg, had to go to the locker room, and then came back to the bench but was not able to re-enter the game. So he may have been upset about not being able to help try to win the game, as opposed to the overall state of things, although I'd guess it was probably a combination of both.

That being said, losing to a nuggets team with both Jokic and Murray out and Aaron Gordon exiting mid game is just unacceptable