I wouldn't jump the bad parenting gun though so quickly. Some children really can't help it (i.e. autistic children, tourettes) and you probably wouldn't really know the child had a need just by hearing noises coming from the other room.
When we went this past Aug DD had something going on, we went to several different doctors and no one could tell us what was going on. Our GI told us to go to Disney since it wasn't anything "operable".
We went and she was getting worse behaviorally, facial spasms, taking an hour to eat. We came home and we saw 3 drs in one week, we were scheduled for an MRI 3 weeks later. School started, and within 1 week DD was back to normal, our ped. said it was her reaction/anxiety about going to school for the first time. She got herself so worked up that she couldn't control certain things, and it got worse while in Disney b/c she knew that when she came home from Disney she was going to school.
And its Disney, its hot, kids are up crazy hours, and are overwhelmed, meltdowns are bound to happen.