I have my fair share of Aussie friends (they are well represented in Japan) and the differences between them and in and amongst groups of them is as different as any other random set of human beings - and I never noticed them to mince words less or more among themselves or when not among themselves for that matter.

Good thing I have spent time with so many Australians or I might start to develop a prejudice as this AusMac guy does have much that distinctive holier than thou attitude about him as that other Aussie, "I will probably never speak to you any of you again" Treebeard.
We are what we repeatedly do - Aristotle