If you want well behaved American theatre audiences get the hell out of midtown and see an off Broadway show. That is where you will find good audience behavior. Not, in the great but tourist trap shows of midtown.
For example, on Broadway at any given performance of Wicked, there is a sure fire shot that there will be entrance applause when Elphaba enters the stage, cheering during the final riff of Defying Gravity and the undeserving standing O.
I was recently at a performance of the AMAZING off Broadway Pulitzer Prize winner Ruined. And despite it being a VERY moving and a VERY well acted play and one that is deserving of a standing O, only a handful of people actually did.
I am actually taken a back at the different reactions in the audience between shows that attract a different kind of audiences. For example, the differences between an audience at a Broadway show that is predominately tourists verses one off Broadway that is predominately New Yorkers.
"If you try to shag my husband while I am still alive, I will shove the art of motorcycle maintenance up your rancid little Cu**. That's a good dear"
Tom Stoppard's Rock N Roll