When I was a kid there was a saying that was already kinda politically incorrect. My mother used to say it regularly, out of nostalgia for a more "innocent" time:
When you did someone a favour and they said "thank you", instead of saying "you're welcome" or the Australian equivalent ("no worries"), my mother would sometimes say "I'd do the same thing for a blackfella". It was kinda funny coming from my mother because she was one of the least racist people I knew from her generation.
I wouldn't use the expression myself. I used to jokingly use some racist terms for certain ethnicities but never do so any more as I have kids.