I can't with people who use flash photography or video record with their screen open, full brightness on.
In the Lion King show, I lost it and tapped the shoulder of the person in front of me and nicely inform them they were HD videos on youtube and their screen was blocking the view and the light was annoying.
They lowered it but kept filming. I'm still happy I said something: they have their freaking video with me telling them about youtube on it lol
Flash and screen light ruins the experience, the ambiance, and you're not taking it in when you are recording it.