players frustrating players, frustrating coach's

Just following up to the frustrated coach's son thread.
I've had some players who were really very good, but thought they were better than the other players.

eg: Pitcher pitching in a 1 run game, yells to me in the 6th inning that he can't do it all himself.

My thoughts were that he is getting frustrated by the lack of a lead to give him breathing room, but I also thought that he wasn't acknowledging his teammates play, the players who were getting the out's from the ground balls etc. I looked at the players and could see in some of the expressions that they didn't like what he said. So 2 things could have happened that the team reenergized and got him some more runs to work with or would the team go into the tank?
The team went into the tank.
So in hindsight, should I have pulled the pitcher? Yelled at him that the team was doing good for him? or just realized that he was frustrated and kids even at 15 will say some stuff that they do not mean and ignore him?

Wally K