Some Aussie guys can be a bit rough, foul mouthed and bigoted. A Thai guy I know had to give up going to college there as he was being hassled so much.
I had an experience with a very rude Australian guy doing the crocodile demonstration at a zoo near Cairns. Right off the bat, he said something about how Americans are known for alligator wrestling and then asked if there were any Americans amongst the spectators. I raised my hand and he asked me if I wanted to wrestle his giant salt water croc. I shook my head no and he said something quite derogatory about Americans like myself. I did not need to say a thing as the Brit spectators let this guy have it for being such an ass.
I regret just answering with a "no" nod. The perfect response...using a cajun style accent... "nah thanx, but I sure would like ta rassel with them thar alligators I saw elsewhere in this here zoo of yars."