The thing with the chanting and cheering that they don't seem to get is that there's a time, place and limit to it. You don't do it when you're in line in an enclosed space. But, hey you want to do a little bit of it when people are filing into the amphitheater waiting for Fantasmic to start, fine. As long as you aren't constantly going back and forth with another group trying to drown each other out for five minutes before CM's finally intervened.
I've never understood why these large groups have to all stick together. It might make things better if they could at least split up into smaller groups of 15-20 at most. Our school sends down their band and chorus kids every three years to perform and spend some time at Disney World and they don't make them all do everything together. Their rules are: 1) Everyone, kids and chaperons, go to the same one park per day, 2) You have to go to the park; you can't hang out at the hotel and 3) You need to be in a group of at least 4 people. It works great. All of the kids may be in one park; but they're spread throughout instead of all of them being in one spot. Is there honestly some reason these groups couldn't do something like that too?
To me the bottom line though is that you spend a good amount of money for a Disney vacation. And your money spends just as good to Disney as the tour groups' money does. If you run into these groups and they're bothering you by cutting in line, constantly chanting or something like that, complain to a CM. If they can't/won't do anything, find a manager and complain. And if they're at your resort and bothering you, complain to the management there. Tell them you want a different room. If a different room at that resort won't help, demand they put you up at another resort of equal or greater value at no charge to you. Yes, they have a right to book these groups into their hotels. But you have just as much right to enjoy every moment of your vacation, especially when they want to charge you the prices they do.