The London 2012 silver medal winner and his father Martin have appeared in court after a dispute over whether to get a taxi home from an event.
Judge Seamus Hughes said John Joe Nevin's punishment will be to give a four-hour boxing master class to young people at Mullingar Boxing Club, Co Westmeath.
Judge Hughes said he would follow the example of his colleague Judge Alan Mitchell, who ordered footballer Paul McGrath to spend a day with young people in Tullamore's soccer club following a public order incident.
The Nevin incident at Mullingar's Castle Street in the early hours of July 21 this year didn't show father or son in a good light, Judge Hughes said.
Inspector Jarlath Folan said the argument drew a crowd and caught the attention of two gardai who were on patrol.
The two men, both with an address at St Anthony's Cottages, Mullingar, were roaring and shouting at each other and both were intoxicated.
John Joe was aggressive to his father and ran over to him as the older man tried to get into a taxi. The boxer was also aggressive to one of the gardai.
His father also put a curse on the other garda at the scene, the court was told.
Judge Hughes was unimpressed when he indicated he might not have time to give a master class as he is going to America soon for training.
He said he didn't care about America – and that Nevin hadn't cared about America when he was "acting the bowsie on the streets of Mullingar".
Nevin is to return to court on December 5 to present his plans for the master class.