Where did I claim that? What is it you think freedom of speech means exactly, if you think it can be only available to some and not others?
Well that's just the medium, freedom of speech and expression goes a lot farther than that.
Well oddly enough this is a privately owned forum, so the owners absolutely have the right to decide what can and cannot be expressed. A legal right to freely express yourself, does not mean privately owned platforms are obliged to let you use their platform at all, as Donal Trump found out, though he and many of his supporters seem to have failed to understand the difference.
If I phone the Daily Mail tomorrow and insist they publish my views, they are not in any way obliged to do so. The government on the other hand cannot stop them publishing any view they want, or stop me expressing any view I want publicly, as that would be censorship. Unless of course my views broke the law.
Remember that awful homophobic bigot Israel Folau, and his bigoted hate speech. He wasn't braking any laws sadly, only a contract of employment with the Australian rugby union, and they rightly terminated it for breach of contract, as he had previously been warned.
People often misunderstand that censorship is not necessarily illegal, even by a government in a free society. If you signed the official secret act for instance, then you are in effect agreeing to be censored. You cannot be censored from making defamatory comments, but you may very well be prosecuted in a civil lawsuit.