This post seems absolutely crazy to me. If you look at history, one (if not the) main usage of censorship is as a tool for the powerful to oppress their opponents. Ideas that go against established institutions are often by their very nature offensive. Book burnings and similar atrocities such as Entartete Kunst aren't some hypothetical dreamed up by paranoid philosophers, they are real things that happened, are happening and will happen.

I think there are ways to deal with jerks without limiting free speech (e.g. user customizable filtering of content, so people can themselves decide whether to view content they think is objectionable), but if there wasn't I think you have to at the very least recognize that there is a very real cost attached to curtailing free speech.

And of course the moderators of such a forum would never lean to one side of neutral and define 'hate' in ways that would benefit them politically! Just like how twitter very fairly enforces the rules against liberals just like it does conservatives! /s