Baritone orders three phone users to leave Concertgebouw recital

From Jane Hargraft:

I attended a recital tonight (at the Kleine Zaal of the Concertgebouw) with baritone Christopher Maltman and accompanist Julius Drake singing Eisler’s Hollywood Songbook. It was a very fine concert – but Mr. Maltman stopped mid-concert in the second half to address three young ladies in the back of the hall.

‘You are directly in my sightline, and it’s clear that you do not want to be here. I can see you chatting and using your phone. If you do not want to be here, leave.’ The audience applauded warmly.

This appears to be a trend. Actors on the London stage have complained recently of audience members talking and eating during their performance. Have other readers noticed the same thing?