A group of five - including Scoullar and his friends Sheridan Christopher Raynor Foot (19) and 19-year-old Taylor William Meikle - had driven to Central Otago to attend a car show and stopped at the popular destination on the Luggate Highway.
The group had been drinking and were "actively looking for trouble," police said.
"You and your mates were on a booze cruise really," the judge said.
Meikle, holding a beer bottle, confronted an Indian man and his daughter.
"You should go back to your own f***ing country," he said. "It's my country and not yours".
Scoullar told Probation, in an interview before sentencing, that he was embarrassed by the remarks of his mate.
Judge Phillips though said his actions contradicted that claim.
An Australian tourist, standing in Puzzling World's foyer, stepped in.
"When someone remonstrated with you about what was happening, all of a sudden all hell breaks loose," the judge said.
One of the defendants threw a beer bottle at the victim, which he ducked to avoid.
But that was followed up with a barrage of punches and kicks.
The victim curled up on the ground with his arms covering his head while his wife and children witnessed the frenzy.
Scoullar was eventually pulled out of the fray by his girlfriend.
But the attack continued on the victim after a brief lull.
One of the defendant's ran up to the man from behind and wrestled him to the ground again, putting him in a headlock.
The victim's wife was dragged back by Meikle when she tried to intervene.
Eventually the group fled the scene in a ute leaving the Australian man with bruising to his chest and upper body, grazing to his elbows and knees and a sore neck.
Judge Phillips said the incident was particularly distasteful because of its location.
Wanaka, he said was important in the country's overall tourist industry and Puzzling World was a "vital part" of its allure to overseas visitors.
Foote was sentenced to six months' home detention and 150 hours' community work while Meikle got eight months' home detention, 200 hours' community work and was ordered to pay the victim $350.