Incorrect. Individuals, organizations, and companies that host a platform have a right, given by the concept of freedom of speech, to determine what kinds of speech that they want to host on their platform.
Freedom of Speech only protects you from government censorship and actually protects the right of platform owners to determine what is and is not appropriate for their platform. If you’re unhappy with the rules of a given platforms, or all platforms, there is nothing stopping you going to another or creating your own.