The problems are Arsi
[a] Americans have no sense of humour and it would never occur to the majority of them that you could be joking.
and
[b] Cat Eyes takes offence to 'most everything and, although she may know you are joking it doesn't stop her getting riled up about it.
I dunno if anyone can be 'pure australian' as australia was colonised by a mixture of pacific islanders and koreans about 50,000 years ago and the British have only been infringing on the land for 200 years.
As British Aussies go I'm about as pure as I can get as my family as never thought it necessary to mingle with those damned 'greenies' (

) over the course of the last two centuries.
Oh yeah, racism against olive-skinned is a healthy phenomena in my part of the world. We call them 'wogs' or 'ginos' and the ones that really shit me are the third or fourth generation aussies who crap on about Italy (or Greece, or Macedonia, or Lebanon, etc, etc, etc) and bung on a fake accent despite never having been further north than Sydney or Surfer's Paradise.