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I'll talk about anything with anybody.
The worst ideas are the ones that most need drubbing in the town square.  You don't want that stuff to fester in the dark, for the same reason you don't want it held unchallenged in the light.  Discourse is the mode of social progress.
Extinguishing people to quiet dissenting opinions is the action of a propagandist.  After that precedent is set, it doesn't matter how righteous the propagandist's message was, it will turn shortly to elitism and hate.
The system we have right now in USA is fine where everything is free game except immediate directed calls to illicit activities such as violence or disorder.
Agreeable speech does not need any protections, only disagreeable speech needs it and no one should trust a government to determine what non-violent speech is acceptable.
Let the marketplace of ideas and social pressure determine what becomes mainstream or not. Force of law shouldn't be used to shut down mere ideas.