You are absolutely right, Fonty. To accept unacceptable behaviour (and suffer) is the wrong way as it only encourages such behaviour.
Air conducting, talking, drinking, typing - I bet they simply think nothing of it. And might even be grateful if someone tells them politely that this is just not done during a performance.
Of course I understand that it's not so easy to tell people that they are misbehaving.
But just tolerating it could mean that we sooner or later see people munching popcorn, chips, icecream and hamburgers in the ROH.