I think its partially the australian reputation for being assholes overseas, and partly a sort of unionistic culture that tries to demand locals do everything to maximise employment. I got a similar vibe from people in the phillipines, just not to the same extent.

That may be true, but I find Australian accents the most beautiful.

The stereotype is of Australians going over to Singapore for a holiday and being drunk and rude. It's a stereotype, but that's where that hate comes from.