What your missing is that if he’s in his room he’s not exposed to the public. There is no law against waking around naked or partially dressed inside your hotel room or any other place you have a reasonable expectation of privacy. When he opened the door and she saw him. Maybe he’s a nudist. I’m just being the devils advocate. What’s right and moral is not always the same as legal or not. Yes his accidental with the police could be tough but you would have to prove he’s in public and hotels that have a locked door and a desk that only allows guests of the hotel is not technically a Public place. So the hotel would have to tell him to stop and evict him. Arresting him was probably a mistake by the law. This is just my opinion as a retired police office