You said, specifically, that "US legal definition of free speech, at least according to the courts", included the expectation to be heard. That it implied an audience be made available to you.
You need to be able to cite a source, ideally a case or specific law, on such a claim because no one else I know holds to that definition. A link to a Wikipedia article about a different concept does not satisfy, because it does not cite a legal definition of free speech by US courts.
