I'm quitting my PhD
I'm someone who finished a PhD, here's my perspective.You don't believe your supervisor or your research group and so you quit, great. It's great that you have the critical thinking abilities and confidence in yourself to make such a decision.However, I think it's extremely unprofessional to write a blog post saying that your supervisor is superficial or your research group is performative art. I don't say this because I think we should just take the venerable professor's word for it, but because accusations in general, if they're vague enough, are impossible to defend against. I think if there's enough substance to make your comment specific, you should. Maybe even write a paper explaining why what they're doing is nonsense. If you're right, this would genuinely be a contribution to the field.If you can't be specific enough to be scientific about it, just keep it to yourself.