Earlier quoted context omitted.
If only Facebook, Twitter, and YouTube were completely full of willing listeners for hate speech, then that might be applicable. Hate groups aren't sending private forum messages to each other, they're broadcasting Even John Stuart Mill, a founding philosopher of free speech, postulated that speech needs to be curtailed when the expression harms others.
Words can not be violent. If you think one person being offended means speakers must be silenced, then you're on a dangerous pathway to fascism.
You would object strenuously.
Yet I would only be engaging in "free speech".