@PrinceHabib72 The metaphor is not from the individual but from the bar owner's (or instance admin, if you will) POV.
One Nazi shows up at a bar, the owner goes to kick him out. But a concerned patron disuades him by saying that free speech is important and if anyone doesn't want to talk to the Nazi they are free to ignore him. They are perfectly capable of choosing who to talk to and don't stand to be TOLD who they can or can't talk to.