Bougainville is not representative of PNG in that respect.Are you sure? Things change and never assume that Australia is universally loved by PNG or other Melanesian or Polynesian nations. We in NZ need to be reminded of that too in our dealings with the Island nations. It didn't stop Fiji from accepting Russian military aid. In fact with the Bougainville peace negotiations, the rebels didn't want any Australian involvement at all because Australia was seen as the bad guys. It wasn't until the talks at Burnham Army Camp near Christchurch in NZ that they really accepted Australian involvement. So what happens when Bougainville gains its full independence and the PRC arrive with an open cheque book?
However, there is no doubt that we sometimes take PNG for granted, and also sometimes patronise them and offend them in other ways. But none of those things, or the PNG versions in reverse, negate what is the real national interest of both countries. They may well posture around some of that, and of course people have been known to make mistakes in international relation (and indeed PNG occasionally does something it knows will annoy Australia just to make a point) but the basic relationship is still excellent.