Don't you *hate* that? To me, it's just a modern version of "blackface" - you know, we want to see a black character, but "those people" shouldn't be allowed on stage, so we dress white actors up as black people instead. It's *grossly* insulting. Just get a fat actor or actress, for crying out loud.
Wow. Hadn't quite thought of it that way, but you are spot-on.