Good for Patti!
This is one of my biggest pet peeves. I've had this happen to me while on stage also, and it is unbelievably distracting. No matter how in the moment you are, when a glaring light pops on in the see of darkness your eyes will automatically go to it and it will pull you right out of your character.
I was a Top Girls last weekend, in the mezzanine, and there were some teenage girls sitting a two rows in front of me texting, I was ready to clobber them over the head. Fortunately I did not have to as at intermission an usher told them they had to turn the devices off because the cast had complained that they could see the phones and it was distracting.
We were up in the mezzanine and the actors complained!
If you cannot, or choose not to, follow the rules you deserved to be thrown out.
"You just can't win. Ever. Look at the bright side, at least you are not stuck in First Wives Club: The Musical. That would really suck. "
--Sueleen Gay