We were there July 9-17, and, yes, so were the Brazilians.
In addition to chanting/singing/clapping and pushing, they're very good at blocking views and paths.
At MGM, a huge group sat down in the middle of the street in front of the Beauty & the Beast theatre, I guess because they were tired. People could not get around them.
At the Little Mermaid show at MGM, we had two groups in the theatre with us at the same time. The CM working the show bent down to a family in front and said, "Be careful going in; the Brazilians will run you over."
At MK, we were watching the Pirates tutorial, and several came up. One literally used her hands to push a cut in front of me and then to push a little girl who had been in front of me out of the way.
At the MK opening ceremony one morning, a tour guide stepped directly in front of my DD so that he could get a better view. To his credit, when I told him, "MOVE" and pointed down at her, he did step aside.
One night we were dining at a restaurant in a park--a TS place. I don't want to identify anyone. The CM waiter was wearing a nametag that said he was from NY, but he told us the name on the tag was wrong and that he'd had to use an old one because he didn't have his. He then said that he thought it was best not to have a nametag that identified him as being from Brazil because of all of his fellow Brazilians running wild through the parks. We laughed and said, "Yeah, they travel in groups of 50 or so," to which he replied, "No, no, it's more like 100, and it's terrible." Even Brazilians are offended!
We did see some well-behaved groups, but others were not. It seems that those with adults chaperoning were quieter and more polite than the ones with few or no adults in charge.
But as a 15 year old, if I'd gone to a foreign country without my parents, been able to have fun with my friends, and realize that what happens in Disney stays in Disney, I probably would have chanted and been rude too...though I don't get the tight spandex bicycle shorts.
