> If someone is claiming that a girl that likes the dress on the left couldn't possibly like the dress on the right, I think they're the ones with a serious holdup of appearance over substance.

This makes me wonder if you've watched the movie at all. It has nothing to do with arbitrary beliefs of people on the internet and everything to do with Merida in the movie fighting against wearing a similar dress.

In fact said dress was part of my second favorite scene in the movie, and one of the first available clips before the movie's release: http://www.youtube.com/watch?v=taIFiRD18jM