"Hate speech" from the Oxford dictionary: "Abusive or threatening speech or writing that expresses prejudice against a particular group, especially on the basis of race, religion, or sexual orientation."
Far, far, far from what I'm advocating.
And my defence of cultural freedom is absolute.* It would be less than absolute if it didn't extend equally to the critical, as to the criticised.
Also, please note that my distinction between the case of the Police and the case of non-Aboriginal produced "Aboriginal" art has nothing to do with "common sense". It is based on questions of exploitation made possible by socioeconomic disparity.
EDIT: *subject to most of the usual limits, e.g. threats, defamation, hate speech inciting violence, etc.
Your example of aboriginal art is, to my mind, almost like the protected status of the
Cornish Pasty. It's about money and trademarks, not really 'artistic freedom' as such. It regards aboriginal art as a 'brand', and implicitly says that it can be churned out by any old idiot, and will be bought by any old idiot. I suspect that there is more to real art than that and that the market you are talking about is probably separate from real art.
So 'hate speech' now has an 'official' dictionary definition but it doesn't (yet) stop me expressing my own artistic freedom and using the words in my own literal way - even if I am subverting the 'official' definition back at you!
Edit:
Abusive or threatening speech or writing that expresses prejudice against a particular group...
Artists are a particular group. And if they have previously created work while being encouraged by society to do it (The Police were lauded for their virtue
because their music was a bit reggae-ish; Katy Perry was lauded for her promotion of LGBT-type sentiments within the mainstream) they cannot now change it, just as a person cannot change their sex or skin colour. It can never be fair to level (literal) hate speech against a person who cannot now change the offending aspect of themselves, and which aspect would have been encouraged by the very same people at the time. If you see what I mean.
If not, it tells would-be artists that they can never be free of the possibility of being ostracized, ruined, shunned, cyber-lynched by society at any time in the future, despite their best efforts to be nice, virtuous people. Best just to work in a factory instead...