Guarding and disciplining generally does not embarrass suspects. There won't be too many physical conflicts between detainees. If there is, the police will intervene to stop it. As long as people are safe, everything else is trivial.
The suspect doesn't hit anyone, he will recite the prison rules three days before going in, and then he will pull back on the fourth day. He can't recite the toilet, but he can recite light work arrangements, such as cleaning the floor and folding towels.
Entertainment means chatting, watching TV and playing cards. These are arranged according to a fixed schedule. Most of the day is "sitting on the board".