Based on what I've read about and of Jordan Peterson he's not someone I agree with, but is he a white supremacist? What evidence is there of this? I tried to google but didn't find much.
One of many examples is having a public, recorded conversation with known white supremacist Stefan Molyneux on the subject of purported ethnic differences in IQ, based on dubious or outright debunked studies.
You are the company you keep. If I have a history of walking in neo-nazi marches, not only does my denial of being a white supremacist seem suspicious and hollow; additionally it quite frankly doesn't even matter what my innermost opinions are. Because I have supported and legitimized nazis by engaging with them and hold the blame as well.
Same with PewDiePie. Even if you by some bizarre mental gymnastics could argue that all of the white supremacists he followed on social media before purging them, the sign saying "
Death to all Jews" which he had displayed, or his repeated use of the N-word as an insult, were all trolling or joking or what have you, and he isn't a racist deep inside (spoiler: he is).
It - does - not - matter. His actions and words are what affects the outside world and disenfranchised and oppressed groups. Not his innermost thoughts and feelings, which can be known by no-one but himself.