OK, so I understand the no flash photography on dark rides...completely understand the flashing could ruin the effect and experience, but the small screens on video cameras, c'mon, seriously?

Not because it isn't allowed by DISNEY (you know, the ones in charge) but because it 'distracts' or is a personal annoyance? Tough dog doodie.
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How about you go sit in a dark ride/theater where you can hardly see what is going on in the attraction because there are dozens of lights in between you and the attraction? It also ruins the effect, because your eyes are naturally drawn to the lights. You can try to look away or look over them, but your pupils are still picking up that light source and contracting, so you can't see as well in the dark to see the attraction. It's a physiologic response.
And can certainly be compared to affecting the attraction much like flash photography, as the dark rides were not designed to be ridden through with a light in the vehicle.
No, I won't yell at people for it, because it isn't prohibited. I'm just reminding people to be courteous about this practice when they can (i.e., if they can turn off the screen and use the viewfinder), because most are not aware that it does affect the people behind them. I'm sure I've been guilty of it at times as well.
Your "tough xxx" comment was a little out of line.
And your comparing it to complaints about children, etc. have nothing to do with this thread.