I was never really much against flash photos in rides, i found them annoying but coped.. until Nemo and Grand Fiesta opened at Epcot.
My ride on Nemo was a flash every 5 seconds from both two vehicles infront of me and the vehicle deirectly behind me. It was beyond annoying.
Further, Grand Fiesta - this woman kept turning around to take photos and literally blidinging me because she was pointing the camera right at me.
Around the "small world" section I became proactive. I turned on my camera and decided to put her little point and shoot to shame. I just had my camera sitting and waiting. Everytime she spun around to take a photo and blinded me I took a photo with my much more powerful flash.
The first time she looked shocked and seemingly didn't understand what had just happened. The second she looked annoyed, and the third she looked downright irate. I have the photos to prove it
By the fourth time she swung around to take a shot (remember, this started with me doing it in the small world scene) we were to the Fiesta and she pointed, went to shoot, and stopped as I raised my camera right at her and smiled. She huffed and stopped for the rest of the ride.
I am absolutely NOT condoning flash pictures in rides.
It ticks me off. It bothers me like crazy. I think the equivalent would be listening to a song you really like but having it peppered with loud beeps every 20 seconds.
HOWEVER... if that story's true (I'm just sayin'), I would like to say something about how it was handled.
Witness if you will the 70 year old family member I usually travel with and facilitate. She is
OLD. She is a baby boomer. If you want to talk about "It's my party and I cry if I want to", she was the inspiration for that phrase.
We're on PotC... actually it happened on a few rides, but Pirates is the one that most bothered me... and she starts snapping away like she's trying to scare gremlins off the set. P#*$^@ me off, actually. I very firmly (as firmly as a youngin' like me can tell his senior. Maybe even a bit firmer) told her that she shouldn't be doing that. She got upset and kept going just to spite me.
Now then, put yourself in the backseat and pull that same sort of payback move you just described (put on your Guy Fawkes mask while you're at it).
You think she'll react? No. She's just gonna get ticked off. You will awaken the sleeping giant. And last time that happened in the last century there was fallout and person-shaped grease stains left in the wake.
You just spent most of the ride angry, seeking vengeance, not actually ENJOYING it, and at the end you didn't solve the problem, you just took someone down with you... with the possibility of the dispute escalating to further heights.
Now, my grandmother isn't the only person with this attitude. There are bigger men, meaner women, and older geezers probably willing to pick a bigger fight. Is that the way you want to spend your vacation? Donning your stretchy pants and cape and thwarting rudeness whilst sacrificing your holiday?
In my experience (remember... I get angry too. Probably at even more things. Ask my girlfriend, I am the most grumpy, sensitive, hard-headed person) it's best to take a page from The Art of War... or Ghandi if you like the other spectrum, and realize that you've won when you don't fight at all.