This seems to be a big factor in it. I think that there is a certain amount of willful ignorance or a who-gives-a-***t attitude in the US. Knowledge about how other countries work can be dismissed as only for the elitists, because, you know, this is America, and we're the best, so who needs to know about other countries, or even where to find them on the map.
Learning about other religions or cultures gets dismissed as catering to a PC agenda.
Mentally calculating a 15% tip in one's head gets blown off because we can just whip out the calculator on the cell phone.
Jaywalking is funny, but it is still depressing that he doesn't have to go far to find such silly answers, if they aren't being faked.