I agree. Don’t get me started on those barbarians who take calls on their phone during a performance. I could get really really nasty to such.
A couple of times I’ve been in an audience where someone starts doing stuff on their phone (not calls) and you see a glow emanating from their seat. It’s infuriating, particularly if it’s a dark scene where you want to be focusing on the stage. If it’s that boring for you why did you come.