Racism exists in Australia. As to why they are eager to come here, how do you know they know it exists until they get here? My family didn't know.
Sadly with social media it has gotten worse and the closet racist now feels free to say anything at will with the anonymity of the internet.
It is the new reality although not exclusive to Australia. America and the UK are pretty much leaders also exists in Asian countries like Malaysia with the Indian and Chinese population.
Not sure why it is difficult to accept, more important let's not be don't be part of the problem, accept people on who they are not the colour of their skin or the language they speak.
You talk as if racism is only a white problem...