Here is my point of view. Please read. Sorry about the length...
We were at WDW 7/8 - 7/18 (knowing about tour groups. We have traveled alot in July). I came mentally armed, and decided to take a less judgemental view of the groups. At the beginning of the trip I found fewer tour groups than normal, but that RAPIDLY changed by 7/11+. I think there might have been more than I recall in past years. Anyway, I decided to really examine their behavior...
The kids are, I believe, 15 years old (trip for their quincinera - spelling wrong I know!). 15 year old girls are annoying, no matter what culture. Im sorry, but true

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I was annoying at 15 years old. A
group of 15 year old girls is unbearable to tolerate, through no fault of their own. Seperately, these kids are nice and polite (for the most part). As a group, the mob mentality sets in and that '15 year old' behavior is magnified...
I think alot of this inappropriate behavior is egged on by the tour guides (who SHOULD know what is appropriate behavior). So, when tour guides start chants, or generally encourages this behavior, the kids follow suit. In addition, I personally witnessed SEVERAL times this past trip of tour guides telling the kids to sit in the middle of the streets, just outside of an attraction exit, etc to give instructions and to do their head counts. This causes a HUGE disruption in crowd flow for the rest of us and I am IRRIATED by the tour guides and their policies (whom a majority of didnt seem much older than the kids).
I am also irritated by Disney. 18+ years ago I was part of a 250 group band that traveled to Disney for the 'Magic Music Days' program. I CLEARLY remember being grouped into groups of 5-7 with a student 'leader'. We were not allowed to be in larger groups touring the park (our school said it was as Disney rule. Don't know if it was true) and we had set times we had to meet with our tour guides. It seemed to work, and although we were annoying (we were, afterall, 15 years old) - it was not magnified by a group of 200 but just 5 of us.
I DO NOT agree with large groups traveling together at a theme park. It interferes with crowd flow imho, and is disruptive to other paying customers. I DO NOT agree with tour guides innundating the fast pass machines (I witnessed SEVERAL times 4 tour guides taking up 4 out of the 5 machines getting hundreds of fast passes). I understand everyone has a 'right' to the fastpass, but there has to be a better way than 200+ kids having to HAVE to get on a ride at the same time. I DO NOT agree with ENTIRE groups innundating a counterservice restaurant. This applies to ANY group from ANY culture and ANY nation.
What about the way we were required to be split up in smaller groups? How about a tour guide 'responsible' for the touring, eating, and fastpasses for about 15 kids at a time? The tour guides can communicate with each other through those fantastic walkie talkies they have if there is a problem. Only one flag needed at the end of the night to gather all of those mini-groups together. Why the 'need' to travel in huge groups? A HUGE unified group? I think this would appease both us non-tour group visitors, CM's, and general theme park crowd flow and control. The kids would still be supervised, probably better so, in smaller groups.
Just my opinion. I don't think we will be back in July next year though. Definitely August instead
