Joseph Parker has accused Anthony Joshua of a lack of respect over his refusal to speak to media from New Zealand and Samoa at a workout on Wednesday.
The 26-year-old, who meets Joshua at Cardiff's Principality Stadium on Saturday week in a unification fight for the WBO, WBA and IBF heavyweight titles, insists his compatriots deserved better treatment.
Joshua concluded his media duties before those from New Zealand and Samoa had spoken to him, and after a period in which Parker felt he had been particularly accommodating to those from Britain.
It remains unclear whether Joshua's perceived snub was deliberate, but Parker said: "It's a little disrespectful because they've travelled a long way to come and see him, and they respect him, as a fighter and what he's achieved. But it's a little disrespectful.
"We were in camp in Vegas, we had a lot of British media come over and we were very friendly. Being ourselves, inviting them into our home and making them some nice food, which I was very sad to see because I was eating other food.
"He should just be a bit more respectful in talking to everyone who was there. Hopefully in future he can make it better."
The heavyweight's promoter David Higgins then warned the judges of the importance of scoring the fight fairly, even though Fury felt Parker was wrongly awarded victory when they fought.
"We're grateful to the British Boxing Board of Control, this time they've opted for a balanced panel," said Higgins.
"That means a neutral referee, from Italy, a neutral judge from the United States, one judge from the UK, and one judge from New Zealand.
"This fight is so big, and there's so much scrutiny on the officials, they should know they won't work again if they favour the home man obviously."
