He is Joey Barton

Shearer said he made a mistake putting Barton back into the team, and that his tackle was "a coward's tackle", to which Barton replied that he was "the best player at the club", and Shearer had to play him. Shearer said that Barton wasn't, that he was "shit". Barton replied that Shearer was "a shit manager with shit tactics". When Dowie intervened, Barton called him "a prick".