Can my mixed Asian/Caucasian kids expect any racism in Australian schools

I'm Australian male (white, fwiw) but been living in Asia for 16 years and thinking of returning to Australia, and now have kids with my wife who is from an Asian country. This may be an odd question but I have no idea about most things back in Aus these days. I'm wondering if my kids would face any racial abuse or subtle name-calling or exclusion etc at typical public schools. I remember back when I was at school there was a fair bit of underlying tension at school on that front.

For example, when we were visiting back in Melbourne a trady at the house said "Ni hao" to my son just in this really annoying way. Maybe a small thing but apart from the fact that my son has no Chinese heritage it was just really annoying and kind of insulting.

Update: Thanks for your responses.