Your initial point that GP is making an unsubstantiated claim about the intentions and strategy of a large group of people with diverse motivations is a good one, but the claim is stated in a rather unproductive way that detracts from your argument (significantly).
> Get a time machine, tell that truck to James Madison. Tell it to John Stuart Mill.
This second argument seems like a straw man to me. The GP is not saying that we should apply new ideas about speech to past thinkers. GP is instead simply stating that the left happens to have these ideas about speech and that this is the intention of them.
> There is one proven way of raising consciousness and of expanding the possibilities of consciousness, and that's free speech. Every other mode of conceptualizing the kaleidoscope of realities leads to bad places. Every other mode other than free speech is a blasphemy against the Enlightenment. I will defend your right to blaspheme of course
Once again, I think that your argument here that free speech is the only way to raise consciousness is an interesting one with significant merit, but the subsequent straw man really derails it. You imply that the GP is "blaspheme[ing]" free speech, but GP does no such thing.
> I will defend your right to blaspheme of course, but reserve my right to sneer at your "dialectic" and at your deeply broken toxic simile about how "words and speech are exceedingly used like weapons".
This bit doesn't really add much. "words and speech are exceedingly used like weapons" is not a simile, and sneering at GP's use of the word dialectic + the scare quotes doesn't really add anything substantive to your previous assertions.
NB: I suspect that this comment will come off as overly patronizing, and I apologize in advance. I hope that this will at least add to a constructive discussion of this topic, and help other readers focus on some important points in the parent's post.