My sister was called out for singing at a movie. It was a musical, I forget which one.
AI Overview
In general, singing out loud at a movie or a traditional theatrical show is considered poor etiquette and is widely discouraged unless it is an explicitly advertised sing-along screening. The primary consensus is that it is disruptive to other patrons who have paid to hear the professional performers, not the audience members.
The Debate Over Singing at “Hamilton” Screenings
https://www.onstageblog.com/editoria...20sing%2Dalong.