>As for the rest, it would appear I'm thinking more from an (American) legal perspective and the implications of various measures that might be taken,
No you are seeing me state that is a violation of Freedom of Speech and jump the erroneous conclusion that I desire some kind of law, or legal penalty for that violation. I do not.
I merely want to people recognize that it is infact a violation of the concept and stop defending companies when they violate the concept or at least stop saying that is "not a free speech violation" when it clearly is.
If you support the censorious actions have the balls to call them censorious and stand by them.
> Am I violating someone's right to free speech if I refuse to listen on account of exhaustion? Would my old college dormitory's "quiet hours" be considered "societal sanction"?
Aside from the fact this is strawman lets address it anyone
Inaction on your personal part of not listening would not violating the other persons right to express themselves.
You showing up where the person is speaking with a bull horn to suppress their speech is, setting fire to a building to shut down speech is, blocking the entrances to building where speech is taking place is, boycotting advertisers is, calling employers and getting people fired is.
See all of the examples I give are POSITIVE actions people use to SUPPRESS the speech of others.
As to your college dorm "quit hours", this likely would not be a free speech violation either provided the dorms where not promoted or advertised a public space where people free to express themselves and that the hours where clearly known , established and enforced uniformly. How if there were not published quite hours, and tue night there was a vegan rally that was allowed to occur, but then on wed night there was gun rights rally that was shut down because of "quite hours" then yes I would consider that to be free speech violation.