Look. I understand that if you’re listening to acoustic instruments playing music with a large dynamic range, people need to settle down and be quiet.
But telling people how they are permitted to express their love and enthusiasm is a lot like someone who instructs their prospective lovers on the precise mechanics by which they are expected to perform any orgasm they happen to have, and then wondering why no one ever goes to bed with them.
The last thing classical music needs is yet one more insider shibboleth. STFU about the clapping already.