If it really is as bad as it sounds, Disney will HAVE to do something soon. The things mentioned in this thread are extremely discouraging to read, and would ABSOLUTELY keep me out of Disney World during the time period these large groups are visiting.
First, let me say that I have NO problems with visitors from other countries, the color of a persons skin, or tour groups in general, etc... However
The chanting would drive me nuts!
1) It is
exceptionally rude to impose your constant noise on other guests in the park.

This isnt just some kid having a meltdown, or parents yelling at a child. This is intentional. The chanting displays a we dont care about you attitude.
Being teenagers, this thought probably doesnt occur to them. They just want to have fun, have camaraderie with their friends, but that doesnt matter! It is still very rude and annoying to others. Talking to these large groups would be a frustrating lost cause, as it sounds like the chanting occurs very often. This seems to hold true for both the Brazilian groups and the cheer groups that visit. It would be great for CMs to have a stack of small cards in their pockets that simply say Please be courteous to other guests in the park and do not chant or cheer during your stay. Violators may be removed from the park in whatever language necessary (Portuguese, English
). The CMs could simply hand out the cards to the offending groups. Im sure it would go a LONG way to solving the issue
2) The locking arms is downright dangerous and again, extremely rude.

If someone in a party, especially young kids, gets separated by a large tour group all locked together, how do you get to them?

Being a guy, I know that there would be some arms unlocking as I force my way through,

but for many others they would not feel comfortable forcing the situation. What gives these groups the o.k. to create their own large moving fence? Again, they are imposing on others in the park.
As for the long lines when a group goes to a certain ride, well, so be it.
or a little line jumping to stay together
That comes along with Disney.
The chanting and locked arms would drive me nuts however. I havent experienced it, but it gets me upset just reading about it.
Dan