Barb, When you aren't sure what to do, do nothing at this time. I would go w/what the hospital mandates and speak to your workers. If he wants to visit again, that is when I would advise him that only immediate family members are allowed in to see him and that they must be gowned do to his being immunocompromised.
I realize it is very difficult dealing w/him, but I think the best way to handle this particular incident is to sit quietly and work w/your workers behind the scene. You don't know if he truly is nuts or if this was done to push your buttons, but whatever the reason, you will have your say the next time around, i.e., immediate family only.
I hope that Ryan is doing better that he'll be home soon.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.