Loose Connection. Over the years I have met quite a lot of Australians in NZ and their own country.
I have also helped to entertain some of them here in NZ.
Some of those I met were unbelievably rude, some were overbearing, and some did nothing but moan about everything.
However, unlike you, I do not tar all Australians with the same brush.
Kiwis, like most Australians, are known worldwide for being friendly and welcoming to those who visit their country, so maybe your attitude and behaviour had something to do with the impressions you formed of us.