Sorry, but I don't see anything in the Constitution about the right to be heard by everyone.
There are two aspects to this.
1. Is this idea actually constitutional?
2. Is the private censorship effect a real threat to the Republic even if it isn't addressed in the Constitution?
I think the answer to both questions is "yes." Clearly you think the answer to both questions is "no."
One of us needs to be convinced of what is actually true here.
"I did understand however, that my oath to preserve the constitution to the best of my ability, imposed upon me the duty of preserving, by every indispensable means, that government -- that nation -- of which that constitution was the organic law. Was it possible to lose the nation, and yet preserve the constitution? By general law life and limb must be protected; yet often a limb must be amputated to save a life; but a life is never wisely given to save a limb. I felt that measures, otherwise unconstitutional, might become lawful, by becoming indispensable to the preservation of the constitution, through the preservation of the nation. Right or wrong, I assumed this ground, and now avow it."
Abraham Lincoln.