Australians only seem to shitpost when the subject matter is retarded anyway. It's how they respond to bullshit. You can walk away, get angry or you can do as the Australians do: heighten the foolishness for the amusement of themselves and others.
This extends to IRL. Remember the recent "controversy" when the Aussie chick made a mockery of the Olympic breakdancing competition? What absolute niggerloving jew added shit like breakdancing to the Olympics? It's retarded, so the Australian shitposted.