The sign was not very hard to miss: ANY AND ALL CHRISTIAN MUSIC IS BANNED. That message was posted on an organ located in a commons area of Cambridge House, a condo building in Port Charlotte, Florida.
In fact,that looks to me to be a "bait sign" put up by a Christian wanting to look persecuted.
In the entire history of the world,the only nations that had to build walls to keep their own citizens from leaving were those with leftist governments.
The Bill of Rights only protects rights from government actions. A private entity can ban whoever and whatever they want. You don't like it, go somewhere else.
That's not how the courts have ruled, but that's my take on the matter.