I wonder what that little boy behind you was fishing for in the fountain
I have never experienced the Brazilian tour groups (and hope to never experience them or the cheerleading groups). The only time I remember a large group being obnoxious was in the HM - a group of male high school students were in the buggies in front of me and being loud and a couple of the boys kept telling them to behave themselves (they looked thoroughly embarrassed when we exited the ride). When I passed these two boys, I told them their mommas would be proud of them - they laughed

(well, probably AT me rather than in agreement since I raised 4 boys but you get the picture).
Love Epcot at night - so relaxing to wander around the countries!