All right @HeerJeet pointed out the Peterson thing is more substantive than a dumb internet blowup so I deleted my snarky tweet and here is a writeup of what actually happened. I'll check before snarking next time.
https://thewalrus.ca/the-story-behind-jordan-petersons-indigenous-identity/ …
if he's claiming to be a tribal member then he is, in fact, making the claim to be a minority. And since he advocates speaking precisely, he deserves to be held to his own standards.