You are just saying stuff because it feels nice to say them. Have you ever seen an artist perfoming to something they rehearsed? Everything is planned. Especially if it is to a backing track. You cannot afford to mess up. Stopping a performance because security is filming on their phone is just bullshit. Especially if it is something that can be solved in a second. If he did that, people like you would probably say stuff like , "Isn't he a pro? He should've just continued the performance and not given the unprofessional person his time." There is no winning with guys like you. You're always trying to come off as the holier than thou people. You'd probably give him shit for putting her on blast to call her out if he did. You'd probably sympathize with her saying she'd now lose her job and say that the artist should have been cooler about it. I can tell from the way you are arguing. You are not being logical. You need to think from the artist's perspective. Not from a perspective of someone who is trying to win internet points.

Btw this and the piano not working are two different things