The appropriate comparison is to hate speech – speech which is never tolerable. The kinds of things I wouldn’t say in this comment. Some racial slurs might qualify, in my opinion, but it would be particular phrases using them and not necessarily the slur itself. The N word is obviously not hate speech when certain people say it, otherwise lots of rap music would be illegal. But there are certainly hate speech phrases that use it that are just as bad as a Nazi salute.

Freedom of speech, like any tolerance, needs to have limits and this is a very reasonable one.