Liverpool manager Kenny Dalglish stopped short of criticising Andy Carroll for his reaction to being substituted at Newcastle but told his players to deal with their frustrations in a better way.
The struggling striker endured a miserable return to the club he left in a £35million deal 14 months ago, receiving a regular chorus of boos from his former fans, getting booked for diving and then having to watch his successor in the number nine shirt, Papiss Cisse, score twice as Newcastle won 2-0.
His frustrations were then capped when he was substituted, with the England international heading straight down the tunnel and taking off his shirt rather than heading to the bench.
"When Andy came off and went up the tunnel, he was disappointed with the way the game was going, not necessarily for himself, but for the team, and the frustration took him up into the dressing room," Dalglish said.
"We don't have a problem with people showing their desperation or frustration, but we need to channel it better than we have done."
The Scot was also referring to goalkeeper Pepe Reina, who lost his cool in a late flare-up with James Perch and received a straight red card for a headbutt on the defender.
"The frustration and disappointment resulted in the actions Pepe took when he got a deserved red card," Dalglish added.
Liverpool are on a dismal run of Premier League form, having now taken just eight points from their last 12 games to fade away from contention for Champions League places and bring Dalglish's record into focus.
Newcastle boss Alan Pardew and chairman Mike Ashley had to deal with the fall-out of Carroll's sale to Liverpool in January 2011, which led to many questioning the club's ambition.
They sit 11 points clear of the Reds now, though, and Cisse, a winter signing from Freiburg, has already scored one goal less for United than Carroll has in his entire Liverpool career.
Asked about the way the club had invested the proceeds of Carroll's then-controversial sale, Pardew said: "You don't always get it right, but we managed to get that right.
"We have got some great players here - and actually, some of the players I inherited were the ones who won us the game.
"I felt for Andy, I did. He's a terrific lad and he's having a tough year. But he will come back.
"On our side of the coin, Cisse was terrific, and long may that continue."