Rudeness ?
O.k. I am from Europe and I have been there for the whole first week.
What I found disturbing because different from I am used to:
During the dressage tests people were consistantly blabbing and blabbing (mostly in english - no idea where they came from
?)
Jumping up and down in front of me during the Freestyle during a ride and yelling. Would never do such things - “we” wait with our applause until the ride is over and stop as soon as the next rider enters the stadion.
As far as cheering goes - as soon as an american entered the ring the crouds went ballistic, but a good ride of other nations got applauded by most of the americans around me with a short clap of hand. There a lot of people I know are much more sportsoriented.
What really gave me the shivers and what I never experienced before: The last rider of the freestyle did not even receive her scroe when they had Edward Gal in with the blue ribbon and were already interviewing him for the full stadium to here what his feelings were etc. Man that was rude !!! I never ever had something like that happen before anounce a winner, even before the class was over !
In the XC course I felt very embarrassed by some fellow germans. They had a golf cart with them with the endurance team vet on it as she injured herself and could not walk, but transporting the beer on the cart. They were singing as if in a soccer stadium (urgs).
So you see rudeness everywhere if you want to look out for it.
But all the volunteers already starting at the parking lot wishing you a good day, smiling and loughing. People lining up at the awful foodtend without complaining or shifiting mor trying to elbow to the front. I loved it there and I loved the pretty and huuuuuge area for the games. (And before saying who else has had all 8 disciplines on one ground before - hey in small europe we do not really have a huuge place where no public street goes over and all can be done built in one place).
I experienced a very very nice trip and had loads of fun. And who wants to see pictures can got to my facebook Alexandra Fischer (picture a black pony from behind and me on it). Try to find a picture of Linda (US citizen) also on this forum. She and her 3 friends wanted to cheer with my and my friends flags 
P.S. as a funny sidenote: Did you know that the footing you are refering to was done by a german ? Company name is Otto. So you can not be offended by the comments on bad footing 