You asked for opinions, right? We'll I'm prepared for flames, but I'd like to share mine...
I think that people are a little too concerned with what everyone else is doing. I can understand pet peeves of line jumping, or stroller "weapons" ... anything that directly affects another guest. But I cannot understand the obsession with what other people are wearing, what other people are doing with their refillable mugs etc. Yes, some people dress a little light at the parks. And we may not choose to walk around in similar clothing (or lack thereof) ... or allow our children to walk around like that... But fact is, other people may be comfortable wearing whatever they choose to wear. And as long as it's not against the law (i.e. nudity), I think we all need to be a little bit more understanding of other people and differing tastes, comfort levels, cultures, etc.
(By no means am I preaching, I'll be the first to feel a little awkward when a girl walks around MK in her bikini top, but I'm not going to judge her, or tell her that it is inappropriate, regardless of my personal opinion. She paid just as much money as I did to vacation in WDW and I'm not going to tell her how she should spend her vacation, or what she should wear. And if you want to use the "I don't want my child exposed to it" argument, well it's nothing that my children aren't going to see on the evening news or on the beach, for that matter. Parents raise their children, first and foremost. People walking around WDW are not going to have a lasting effect. Sadly, this is the society that we live in, where the female body is often exploited. And if you want to argue where this is all leading for young girls, and you say down the toilet, I'm right there with you.
And I would go as far as to argue that the lackadaisical attitude towards dress code is a product of our society overall, as we tend to value the skinny blonde walking down the street wearing almost nothing. Barbie, anyone? How about Jasmine, the beloved princess ... is someone going to tell her she is being inappropriate? Her midriff is showing, after all... .. Have you seen advertisements lately? If this image of the female is what we are using to sell products and boost our economy, what we are using to make movies and TV shows, and what is valued in America, then we cannot blame the fifteen year old girl walking around like that. It is a much bigger and more complex issue. And frankly, we do not get to dictate what is appropriate or inappropriate for other people, no matter how much we want to.... Sorry for the rant. )
Anyway, as for the mugs, I won't even touch on that. I just think that if something is not directly affecting your vacation (i.e., you are not being rammed in the ankles by a stroller, or having to wait an extra ten minutes on line because one person decided to hold the place for his family of sixteen) then we need to be a little more accepting of others. There are many different cultures in this melting pot, and Disney World is going to represent that. We live in a free country for a reason, right? If you want the dress of females to be controlled, try living in Tehran for a while ... you might change your mind ...
All I am saying is that I think we need to pause sometimes and understand that, in fact, what is good for the goose, may
not be so good for the gander. To each, his own... just my opinion. Have a magical day.