#1 - how can an opinion be wrong?
#2 - wow, you have really strong opinions about what can be worn in the MDR but now you say you don't go there? Why would you weigh in on how someone wearing a wife beater, cut off shorts and baseball cap not impact your dining if you are not in the dining room? (curious minds want to know..)
#3 - Yes, meals in the MDR are "coursed" (brought out course by course), so, yes, you will wait for your dessert after the other plates are removed. Is this wrong? I think cake is GROSS; does that make my opinion about cake wrong?