What right are you talking about here? There is no right to use a privately owned service in a way that scares off paying customers, much like you don't have the right to spray paint a swastika on your neighbor's house.

The right to free speech means that the government can't punish you for your speech. It doesn't make it illegal for someone to do otherwise legal things (such as banning an xbox live account) in retaliation for your speech.

I don't understand why so many people view the first amendment as a guarantee that one's self expression will never have negative consequences.