First off, you are right. We are all very lucky. I don't think anyone is bemoaning their overall quality of life because a Disney trip is sub-par. That said...
Where do you draw the line? I've seen people defend bad experiences at Disney with harmless juxtaposition to shoveling snow and going so far as to crassly demand people be grateful because hey, at least you don't have cancer. So my question is, when can people complain? Or because it's an experience only a lucky few will ever experience, is complaining not allowed? If I go to a restaurant and the food is bad, is my complaint less valid because there are starving people who would be grateful to have any food, even burnt food?
I'm not targeting you, and I hope it doesn't seem like I'm picking on you, I'm just trying to understand this ubiquitous rebuttal. I'm not saying a Disney trip has to be completely seamless, that's unrealistic. However, it seems like people on the board are becoming more and more militant whenever anyone questions the integrity of the park experience.