Audience behaviour since the theatres re-opened after covid is dreadful. The stories dd has told me are unbeleivable.
You absolutely do NOT sing along. The highly trained professionals on stage are telling a story through song, dance and spoken word. The audience have paid a lot of money to watch.
FOH staff have a very hard job. They let a lot go because they simply can't police everything so I am sure the behaviour of the family must have been quite extreme for them to have intervened.