I have heard many times including dozens of times in recent days the phrase, "they have a right to be heard." This statement is so factually incorrect. While a citizen has a right to speak and express themself in ways limited only by limited rules of propriety but there is no right to compel anyone to listen or view.
Nowhere in the Constitution is there a right to be heard. The 6th and 14th Amendments have been interpted by the Courts to guarantee a right to be heard only as regards a court proceedings.
While one may freely, for instance, stand on the corner of the Square and speak or display a written message limited only by rules of disturbing the peace and/or impeding free flow of traffic but cannot demand anyone stop and listen.