I've Never Heard an Audience Whistle in a British Theatre Dressing Room

Stakellenburg: I've never heard an audience whistle as a form of disapproval. Whistling was just such a fear like this, it would be the force trying to drive you off the stage,. that a whistling was just not done in a british theatre dressing room. A its possibly link to this. Now, stakelinburg stresses that there seems to be a divide between whistling a with the british stage and the american stage. And this, this does click for me.