I've spent almost a year in England, have studied its literature and history, and know a number of English people personally.
I still would never pretend to fully grasp the intricacies of its internal politics and cultural debates.
Even if I made it my job to do so, I'd feel like a fraud because I'd miss most of the subtleties that can only be discerned by long and deep immersion in a culture.
I guess because they see so much of "America" on TV and in movies, they think they understand our culture.
It is quite arrogant and condescending.
Brits think that the Simpsons are hilarious, because they think it represents the typical buffoonery of Americans.