"Bill Clinton's swipe against Bush 41, calling him the frozen chosen, was class warfare. (I had to look it up. I had never heard it before.)"
As an Episcopalian, I can tell you that's how we refer to OURSELVES. It was a joke, not "class warfare".
Maybe as an Episcopalian you do not realize that you are regarded as upper crust by people such as those who attended the funeral. but that is part of the joke.