It's tiring to see people make the case that because the government was not involved, that it's by definition completely unrelated to free speech. Like, you clearly know that's not the case, from this follow up.
Of course the right to free speech does not extend to compelled speech, as you say.
ACLU defended the Nazis because they support free speech. But "free speech" of course doesn't compel them to. But clearly if they had chosen not to, they'd show they care less about free speech than they say.
Like the ACLU of today, who have said that they'll only defend speech they agree with, or something to than effect. Well, morally, do you actually have that value anymore?
Except that heckling and shouting down a speaker is speech too. And thus your argument is incoherent: do you want to restrict speech that impedes other's freedom of speech? If no, then the hecklers must be given free rein; if yes, then the case can be made to restrict racists' freedom of speech as they try to restrict some other people's freedoms, including the latter's freedom of speech.
How about industrial megaphones?
Your free speech only extends so far as it doesn't prevent, prior restraint, someone else's free speech.
"I disapprove of what you say, but I will defend to the death your right to say it"
What you just said is the antithesis to free speech.
No. If the goal of your so called speech is to physically stop someone else's right to free speech, then you are just a thug and don't actually hold this value.
And like I said, many people who do this prevention of free speech admin it explicitly in so many words. They do not care about free speech.
> "I disapprove of what you say, but I will defend to the death your right to say it"
It's a great slogan and a terrific ideal. But actually think it through, in real world situations, and you end up with so many edge cases.