Shearer, then caretaker manager, was furious when Barton was sent off for a rash tackle at Liverpool in May and suspended for the final three games of the campaign, which ended in relegation.
Barton later met up with Shearer at a racecourse - when both had runners in the same race - and they agreed to put the past behind them. "We had a disagreement but we are both grown men and you get on with it. Nothing was said that anyone was going to lose sleep over," the 27-year-old told BBC Radio Five.
"With grown men in competitive sport there is going to be a clash of personalities.
"Emotions were running high and Alan was disappointed; no-one was more disappointed than I was that I had taken myself out of the equation by getting sent off stupidly.
"Things went on in the dressing room and it's well documented certain things were said.
"We've both seen each other since and we've both been very civil about it.
"I'm fine with it, I've got a lot of respect for Alan. I was never going to get in a war of words with him, I have too much respect for him."