As far as I'm concerned, Andrew Bolt being sued for deliberately humiliating a bunch of not-black-enough-to-complain people is far from an attack on free speech.
It all started with Bolt, an inflammatory columnist, penning a column about how certain "career Aborigines" were not dark enough for his liking. He published images of individuals and complained about their taking advantage of a system that is in place to reduce institutional discrimination. His words were ignorant, hurtful and racist. He targeted specific people, got their details wrong anyway, and is now being sued under Section 18C of the Racial Discrimination Act.
This case is now being depicted as a threat to free speech, the basic argument being that "well, we might not like what Andrew Bolt is saying, but he should have a right to say it."