Yes but if you read back, I was specifically quoting this poster who said:
I think you misunderstand what I was saying. I wasn't saying all folks who wear matching shirts behave badly. I was saying when I am distracted enough to notice what other folks are doing/wearing, a good part of the time they are wearing matching shirts/outfits.
I was specifically pointing out some instantces where folks in matching outfits did 'bother me.'
I've seen the mom/daughter in uncomfortable matching outfits mutliple times. It's not the shirts that are an issue- it's when mom (or dad?) goes all out making an elaborate outfit and gets carried away adding impractical frills. They forget the idea is to have fun, and the outfit takes over. I saw this just the other day, and it wasn't just mom- it was dad and maybe an uncle? as well. But the poor little girl had the most extras, and she was clearly uncomfortable. Again, I was specifically answering the question of when the matchy-matchy concept crosses into a problem area.
I also saw last week a daughter dressed in a princess dress: clearly happy - Brother and infant also dressed up in coordinating outfits: clearly unhappy. I wouldn't notice at all except that the boy was complaining loudly as he paraded past my table. The infant didn't look very happy either. Again, that's when I think a parent has pushed the 'we MUST match' bit too far.
This is one of those areas where the internet is a poor means of communicating. When you say 'family', most posters probably think of their primary family of four. When I was thinking of 'families that are a problem' - I was thinking of the extended family groups that are the size of tour groups (and field trips, and cheer groups, etc)- again- answering the specific query quoted above - when do they bother me. They cross a line when they behave like a tribe.
Large groups wearing matching clothes are more inclined to act with a 'tribe' mentality. I think that's exactly WHY matching outfits and uniforms appeal to 'tribes' of all kinds. It is without a doubt why the military does it. And that does go to the heart of the OP's question. I think part of the appeal is that the crowds at Disney are overwhelming. It makes you feel like a drop in an oean. If, however, your group is wearing matching outfits, then they become a teaspoon in the ocean. Lots of folks have said, 'it's easier to find our group in the crowd.' (It also might answer part of why matching outfits are culturally/historically frowned upon in Australia?)
I rest my case.