I don't know at what point something is offensive or not, I think it depends on the person experienceing it. I don't think anyone's speech should be restricted. Exceptions can be made of course for stuff like shouting fire in a crowded theater. All that said, just because one person is entitled to free speech doesn't mean they are entitled to force me hear it. So yeah, if someone decides to use n_____ unredacted, I will use my free speech to call that person an asshole and block them. I don't see the problem with that. Have a good day.