With Sudanese migrants, it doesn't help that the way of socialising often involves gathering and hanging out together in public places, especially as a young man, because where else are you supposed to meet people in your community?
The very sheltered average Australian just sees a gang of black youths and gets images of 1980s movies set in New York.
My wife, who knows better and is well aware that it's awful, still admits that she feels apprehensive about walking through a group of Sudanese teenage boys precisely because her only exposure to black people is from American media. These unconscious biases affect our behaviour every day and it isn't fair.
For instance, why should walking past a group of Aboriginal teens make me any more nervous than walking past a group of Anglo-Celt or Asian teens? In my personal experience, it's the Anglo-Celt kids who are more likely to try to beat me up. Aboroginal kids will more often than not just assume I'm Aboriginal myself and maybe call me brother as they try to bum some cigarettes from me.
On a tangential note, if Sudanese refugees want media exposure, the fastest way to do that is to get the girls into modeling. Some of them certainly have the legs for it, goodness gracious.