Lets just say that my family has had quite a few run ins with tour groups, but especially the Brazilians and Argentinians. One year I remember waiting for my mom to get out of the bathroom after her one millionth bathroom stop and we over at the Tomorrowland Pavillion and the Brazilians were on one side and the Argentinians on the other, shouting back and forth their Countries Anthems, getting louder and louder and more violent. Apparently Winnie the Pooh sides with the Brazilians as an enormous stuffed animal helped the Brazilians wave a flag. We nearly lost my mom and sister in the viscious crowd, and many managers and park workers had to come break it up. It actually got pretty bad.
Every year, we always guess on when our first experience with the foreign tour groups is. I have no problem with them (meaning im not racist or anything like that) but it always starts off normal and then its just a chain reaction of problems with them. If I wanted to see annoying kids from all over the world, Id just go to Its a Small World (just kiddin).
For some reason, I think my dad enjoys having confrontations with these kids. My dad is a big dude and he doesnt like to be pushed around. He doesnt have to speak their language, but if one or 50 try to cut, and he turns around and just looks at them, they run to the back very quickly.
I guess Disney is open to the world and you are always guaranteed to have encounters with guests from all over the place, but I do agree that it isnt just limited to the foreign guests. We Americans can be just as bad and rude. I guess thats the wonderful thing about Disney. It can bring out the kid anyone, or if the line is just long enough, itll bring out the villian too.