Now, the video shows what possibly might what British culture perceives Americans as. They show that Americans don't look at their image and don't worry about weather or not we care about first impressions or not. They show then when the singer sings, when he first begins to sing "America," the crowd begins to laugh. The way that the singer depicts Americans to be makes the audience laugh and shows that they think that Americans are hilarious with how they look, act and behave.
The singer only sings about one thing, America. The verses to his song are nothing complex at all either, just basic repetition of "America" and "the states." The verses seem to show that American people are self absorbed and onyx care about themselves. Patriotic, yes, but the laughter of the audience suggests otherwise. The laughter directs the audience to believe that maybe, they don't believe that the singer shows passion towards America, but shows how they view Americans to be.
Just to how much certain people see, thats how they assume all the people to be. Many cultures will view others by just how they see them in the media, or how others have viewed them. This causes stereotypes. At the end of the clip, we see that a man in a suit comes and punches the singer. Being a British show, it just shows that they needed a British to tell the American to shut up, according to the show that is. This just goes to show, if different cultures could see each other's cultures, in depth that is, than they would appreciate each other a lot more and come to cease with the awkward and bizarre stereotypes.