I don't think it's really that different at Disney than the rest of the world. I'm from NY and I notice here that people tend to be more self absorbed and feeling entitled than most other places I've been.
I'll be the first to admit that I am not the most patient person in the world, nor am I the most reserved, but when I'm paying a ton of money for a vacation for my entire family, I'll be damned if I'm going to let my lack of patience and tendency to speak without thinking ruin their vacation.
I've witnessed awful behavior in many places.
Two examples- 1 Disney, 1 Bronx Zoo
1- On our trip in March, we were lucky enough to be there the day FoF debuted. We did not stake out a spot, nor did we expect to go to the front. We were lucky enough to be in Frontierland right by the beginning of the parade at the right time, and we were able to get a spot right at the end of the walkway where the Splash Mountain Boats turn, across from Pecos Bill next to the food cart. My 2 year old was in his stroller and my 7 year old was - well, in a mood. In front of us were two women, that looked like sisters, with two strollers. They had gotten there at the same time we had. One of the women, walked off and the other stood there moving and dancing around like she was defending against Michael Jordan in his prime to make sure no one got into her "spot" I saw her shove into other people and thrust her backside into others.
Personally, I didn't care, I'm 6'4" and could see anyway. Also, being 6'4", I made sure I was back against the fence so no one got stuck behind me. All the while, people kept trying to push their way in front of my wife and the stroller, some coming very close to stepping on my son who was sitting on the ground. He probably shouldn't have been sitting there, as it is still a high traffic area, but he was in a place in front of the stroller where if anyone DID walk by without trying to shove between, he'd have been safe. When the parade started, his mood lightened. There was an older couple and the wife insisted her husband and grandkids move to the side to let both my sons, stroller included have a great view. As soon as they moved, the two sisters, attempted to "expand their domain". The woman who had moved said something before my wife or I had a chance. So, you have both sides of the coin right there.
2- Bronx Zoo... There is a monorail that takes you around the zoo. If you've never been and you're thinking "oh, like Disney", no, not even close. Anyway, we were there waiting for what turned out to be the last rides of the day. It was late, it was hot, and everyone was tired. There was a family, parents, kids, and I'm guessing grandparents. Now, some people will be subtle, but this woman hid nothing, she was literally knocking people aside blatantly cutting the line. I watched her just shove a young couple with a baby aside and cut in front of them. As she got closer to us, the couple next behind/next to us made a comment about it as well. We heard people attempting to tell her to stop, but she apparently did not speak English- which as everyone knows not speaking the local language in ANY country allows you to shove people aside and cut a line of 100 people. She finally got up behind our little group, and we could see her making getting ready to make her move. My wife said something out loud akin to "she's going to try and cut us" I replied loudly enough for her to hear "Not if she doesn't want an elbow between her eyes" - (again, not known for my patience or tact). She somehow understood that...
Anyway, sorry for being so long winded. I hope I was able to inform and entertain! If I bored you, I apologize.
And as the the noted Philosopher Kristoff once said "Reindeers are better than people."