Andrew Bolt was convicted for impugning various people by accusing them of being white, merely because they and their parents on both sides were physically and culturally white. This (calling people white) has been declared to be a racist insult.
Having created special privileges for black people, many of our ruling elite naturally declared themselves to be of the privileged caste, though few of them have ever been close enough to an actual black to spit on them, nor would they send their children to a school where there was any danger of any substantial number of actual blacks attending . To doubt their entitlement is clearly a racist insult, which must be punished.
Anita Heiss is as white as I am, has never lived anywhere that any significant number of blacks lived, and would never lower herself to live anywhere that any significant number of blacks lived.