Then temporary Magpies boss Shearer told Barton exactly what he thought of his petulance after he had been sent off during his side's 3-0 Barclays Premier League defeat at Liverpool as the club slid inexorably towards the relegation trapdoor two seasons ago.
In Toon: Barton has enjoyed a stellar season for Newcastle
Both men had their say in the Anfield dressing room after the game, and it became apparent that had the former England and Newcastle skipper been given the job on a long-term basis, the midfielder would have been heading for the exit door at St James' Park.
Tough tenure: Shearer's Newcastle were relegated in 2009
However, Shearer has revealed they have met since and the matter is over and done with.
He told the Evening Chronicle: 'I have absolutely no problem with Barton. We have had a pint since and everything was fine.
'Our horses have even been in the same race - we were both there to see them and we had a chat.
'Joey let me down, let the club down and let himself down, there's no getting away from that and I would tell him the same again. But that's the end of it.
'He has had an outstanding season, just as he had in the Championship last year, and he deserves great credit for that.
'Joey has played under real pressure because of his problems off the field as well as on it, but he seems to have overcome them, which is a massive plus.'
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Explore more:People: Joey Barton, Alan Shearer Places: Newcastle, Liverpool, United Kingdom