I was coming home from work one day last year, and this old white dude was screaming racist profanities to a SE Asian couple and their young kids. I got between them and told him he was less of an Aussie then them, and how their English was better than his. He almost punched me but instead realised I am a chick and said he wouldn't punch a girl. I said he's never even touched a girl hence why he's so mad lol.

So not recommend doing this, you did the right thing. Anything else (including what I did) is likely to earn you a punch to the face. It's okay, just remember there is nothing wrong with you, it's 100% their problems.