The "radical right" enclaves on the internet are literally the only places where you won't be banned for not falling in line.
We need to have this discussion in more than one dimension. Left/right and authoritarian/anarchist are orthogonal metrics.
I find that a desire for safe-spaces and monoculture spans both sides of the aisle and seems to be a broader trend in our culture today. Perhaps this desire always existed and the Internet's ability to cater to the long tail has simply enabled it.