I’m American and have never heard Australians described as "Americans in training." Americans generally have a very good opinion of Aussies and see them as different from us and certainly not trying to be like us.
@tomcy6 Aussies beat up on Kiwis and Canadians with underhanded insults as often as they get the opportunity, just in a generally playful manner.
We are saddened to see the Australian government getting a little power hungry and recently treating our Australian friends badly, though.
Aussies still get health care like Canadians, Kiwis and the PoHMs.
The “Americans in training” is basically like calling someone unaustralian.
Which in the “Delhi School of Linguistics” “How to talk Austrians epsiode 2 Grub” youtube video, is summed up at 00:26 in.