I think he either just reached a boiling point on this or something else prompted him to speak out. And Clara T is right, he has been angered for years at Project Runway designers who complain about the real women challenges. Gradfashionista, I wonder about how all this changing bodies affects self esteem.
I see the average height increasing significantly in my and my DH's family. And ethnic makeup certainly affects the average size of a population in an area. So, there are the healthy gains in size, as on average, size tends to increase as height increases, and the unhealthy gains in weight due to other factors, which also lead to increased size.
Personally, I wish someone had told me as a child and teen that part of the reason that I weighed more and wore a bigger size was because I was taller than average. At some point I just thought I'm large, I've always been large, and I'll always be large. I didn't realize I was just a little overweight. And the girls I was comparing myself to hadn't developed yet, and were on the slight end. And then I didn't notice when I really gained weight because, hey, I was large.
I took a look at some of my old size large clothes from when I was younger and I was shocked because they were not clothes someone "large" would wear. But I thought I was huge then.