This was a public service announcement and a brilliant way to sell jeans. Clothes not looking good on every body has been the case for centuries. It's a damn shame if some of you have never been gracious enough to tell a friend (regardless of their size) that an outfit or a look did not work for their body regardless of how awesome they are. That's for those of you who have had friends with that issue.
Everyone should love the skin they are in and show as much of it as they want. However, I have wanted to tell women forever how dangling ass cheeks and rubbing thighs aren't cute in short shorts. Similarly, if your stomach extends further than your ass when you turn to the side, even if you're pregnant, don't do the short shorts thing.