I think there is a big difference between wearing appropriate clothes to what should be a nice dinner, and dressing sloppy and dirty. One should have respect for themself. Why is someone always said to be "judgemental" when they make a comment that is different than someone elses? Hummm, sounds judgemental to me.
There is a big difference to being comfortable on your vacation, which I am all for, and looking like a slob. These are the same people that do not follow the dress code at other Disney restaurants. If you cannot follow the dress-code when one is established, then you might want to dine somewhere else. If there is no dress code, then at least dress nice for yourself! How hard is that? Must have struck a chord.