I lived in Australia for just short of a year in the 1990s and this doesn't surprise me at all. I loved most things about the country, but the racism you heard, particularly towards aborigines, was something that soured the experience. To be fair, it wasn't much better in football and cricket crowds here when I was growing up.
Anyway, this doesn't surprise me at all.
https://www.abc.net.au/news/2020-08-23/persecution-of-robert-muir-story-football-doesnt-want-to-hear/12553554As a follow up, there has been a gofundme for his shoulder op and St Kilda have offered their support.