I thought it was funny, too. Sort of like how an alien might act on Earth if the only referents he had were TV and radio broadcasts. Obviously, the writer picked the most prevalent stereotypes from our culture: one minute the kid sounds like he's on "Green Acres;" the next minute, like an extra on "Bonanza;" then in the next panel it's like he swallowed a hip-hop album but was only able to digest the easiest bits.
It reminded me of some of the satire in Burroughs' Naked Lunch where he parodies the speech of racist Southerners to show how ugly and ignorant they are. So you could say that if reflects the cartoonist's opinions of American culture, or you could say he was showing how kids like to imitate other cultures' speech patterns and mannerisms. Or both. Or some other point of view. It depends on your own.
Personally, I think this is a pretty good country, but it needs some work. And, in my opinion, it needs a new President and Cabinet--one that actually gives a rat's behind about the Constitution and the Bill of Rights. Immediately, if not sooner.