Of course he was pissed to be sub'd in the heat of the moment. Every top attacking player would be. Part of being a great forward is ego and self-confidence.
But I seriously doubt it lasted for more than about 10 minutes... He'll be ready to fight to the bitter end to propel Juve into the final. He knows just how big the stage is. Pirlo, Evra, Buffon, Tevez are the ones who have been here before. This isn't ManCity losing in CL group stages, with no squad cohesion and harmony. Tevez is happy as a pig in shit to be in this place, in the limelight, 1 goal, basically assisted the other, to help Juve beat the CL holders and most expensive team assembled in football history.
Stop making this out to be anything other than silliness.