If you like. I'll try to be clearer.
For W not to know about pop culture things that shallow trendy people think everyone should know about is a good thing. And people who complain that a President doesn't know about shallow trendy pop culture things, or think that it is a criticism of some kind, are exposing themselves as idiots.
Was that easier to understand?
Here's an even easier one: "What do you mean, he doesn't know who I am?"