They're not exempt from the "racism laws."Why are kiwis exempt from protections under racism laws when we basically are in charge of your country.
It's just that cases under the "racism laws" are a civil matter, which means a person would need to bring a case against another person and demonstrate a) the type of comments made were in breach of a law and b) that damage was caused by those comments.
You're more than welcome to bring your own case if you see fit. I mean it's pretty easy to bring these cases against people. High success rate, really bad for freedom of speech.