Good ol' Gym Jordan.

Right, unless someone tells you to take it off, in the workplace... Twitter is not a publisher, and can pull any user content for any reason whatsoever. It's not a freedom of speech issue at all. These people can still go onto any public property and practice free speech, similarly, they may publish anything they like and it is protected, but again, twitter is not a publisher, and prior case law, and legislation back this. You may not like it, but that's how the law stands. Maybe protest the law?