Unfortunately a few bad apples can taint the whole bunch. I have been down at WDW during these times and know for certain that the crowds we see in the parks are definitely Pop Warner. I have also been at the POR when they stayed there. For the most part, they are fine. But, I think it is difficult in the parks and at the resorts when chaperones don't realize how their activity affects others around them. For instance, cheering at 6:30am is not being courteous. Cheering is loud, no matter who you are. And while my DH coached hs and college for 16 years ... I woudln't appreciate being woken up to that.
Also, in the parks, often chaperones let them break into smaller groups but tell them keep together in that small group They can't be with everyone. At those times, I have noticed the language that comes out their mouths is not always pleasing...plus, they are kids. They run in and out of crowds, yell at each other, congregate in large groups where there is some horseplay, and unfortunately it tends to affect other guests. I have seen the same thing happen in the food court. They aren't held accountable to throw away their stuff and can make a horrific mess on the beverage area. But, that being said ... they are kids. And, one day, I'm sure mine will be right there.
Some comes down to the fact that chaperones have to be really on top of it and there are those, again a few, that give everyone a bad name. And, just simply the numbers make them obvious to guest resorts in many ways.
I agree they work their tails off and mostly good kids. But at WDW they do have an impact on other guests -- sometimes that can be good and other times not so good.