Not games i have watched. I have seen yaya toure simile after losses, Seen few Barca players do the same, see a few madrid players too. it happens maybe its a foreign thing but it happens.
Who cares if they smile on camera its what they do in the next game thats important. So they don't look dissapointed when the come off so what. their reaction is not for the fans its for themselves. they don't need to show anything to the fans.
As long as they get in the dressing room and done wrong thats enough for them.