I might offer up that in the past, pre-Standing Ovation era, THAT MOMENT was pretty much the only way for an audience member to voice (or mute) their opinion, whether one of approval or disapproval. That and in the lobby after the show. NOW, though, there is ample opportunity for people to go online later and voice their REAL unvarnished opinion, on social media or in forums like this one. Which clearly happens a LOT. So I guess why be a killjoy right in front of the performers' faces when you can get your views seen and heard and shared to your heart's content later.