ABORIGINAL PEOPLE
Most people from overseas and from the cities, get a shock when they come to places like Coober Pedy or Alice Springs and see a lot of aborigines, many who are alcoholics. People feel embarrassed when aboriginal people come up to them and talk. No need. Aboriginal people might look extremely different and might have a culture that share very few of the West European values as we know them. But they are some of the most friendly and non aggressive people you'll ever come across. Considering all the hardships and oppression they've been through, you might be forgiven for assuming that they hate white people. But they don't, strangely enough. I was adopted one night by a whole outback community at the pub, since they couldn't stand the thought of someone sitting on his own, a concept which is totally alien to them.

Aboriginal people never look each other in the eye, that is considered rude. So don't stare in other peoples eyes.

Some aboriginal people speak very little English, so they might be a bit hard to understand sometimes. Just take your time and listen, and you'll get on after a while.

If they are obviously alcoholics, don't give them money or buy them drinks. An alcoholic is not helped by more alcohol, what ever the colour of the skin. I was never harassed, when I said No politely.

White Australians don't understand Aboriginal culture. Most Anglo Australians find it incomprehensible to grasp that Aboriginal people take no interest at all in becoming white Anglo Australians and living in a suburb in Sydney and grow roses in the garden. Therefore, you will hear a lot of stories and opinions about Aboriginal people, that originate from misunderstandings, to put it "diplomatically".
  Ignore.
  Meet Aboriginal people with open eyes, don't expect to meet the "noble savage" (you'll be pretty disappointed...) and don't believe all the stupidities that white Anglo Australians will tell you.