I guess only parts of the Constitution are acknowledged here.
You are mistaken about the nature of your constitutional rights.
The First Amendment only has bearing on the government, not on private parties. Freedom of speech does not apply on private property. You cannot invoke your “free speech” rights on a private bulletin board anymore than I can demand a right to “free speech” in your living room. As the owner of the property, you have the absolute right to set standards of acceptable conduct or speech, and your guests have to abide by them. If you hold a gathering in your living room, and one of your guests continuously uses foul language in front of your children, can that guest invoke the “right to free speech” when you tell them to shut up or leave? The answer, of course, is “no”. The Firing Line is not a “public forum”, but private property, operating like a private club, and subject to specific guidelines to which you agreed when you signed up for participation.
That's why any claim of free speech suppression on TFL just shows an ignorance about the nature of civil rights on the part of the claimant.
Now, when a moderator locks a thread, it is singularly bad form to open another one just to thumb your nose at the moderator.
Also, as much as some of our former members want to lay claim to being persecuted Free Speech martyrs,
nobody has ever been banned from TFL merely for having an opinion, but for the way they
express that opinion.