England coach Eddie Jones has accused Australia rival Michael Cheika of staining rugby's image with his public outbursts ahead of Saturday's Twickenham showdown.
Cheika escalated the war-of-words on Thursday by claiming Jones has a 'chip on his shoulder', having already accused his former Randwick team-mate of tarnishing his legacy.
The verbal exchange began when Jones questioned the legality of Australia's scrum on Saturday, cranking up the tension as England plot to end 2016 unbeaten.
'If they want to carry on like that, it is their own business,' Jones said on Friday morning ahead of the captain's run. 'It doesn't worry me at all. If he chooses to say those things then it's his choice.
'Everyone makes a choice in life about what they say and how they behave. If that's how he wants to behave then that's entirely up to him. We are comfortable how we have behaved.