If you're looking at people being criticised because they're not writing characters of their own skin colour or sexuality, or 'staying in their lane' with their culture, or because their own experiences don't conform to some expectation (like the author criticised for describing slavery but not how it was in the US), then you're still looking at segregation and oppression, but approaching it in a way that is falsely empowering. It is still massively authoritarian and oppressive and extreme, no matter how virtuous people think the left wing is, and it's certainly not liberal. There's just nothing good about being at the extreme end of anything.
But that aside, and with the crowds on twitter, I just wonder what it will take for people like that to be happy, and not perpetually angry. So much aggression couched in seemingly kind language.