In my line of work, I have to encounter people of various different backgrounds, I used to get irritated because as an American, they would seem really out of it, or stupid to me. But, as I matured, I realized that I was the ignorant one. So, it could be that as you work more you'll advance that way.
There is also a book out, Us Vs. Them, by David Berreby, he seems to located our lack of knowledge on different cultures with our evolutionary past.
Since you are asking a question, it seems that you have a strong desire to learn, so I think that you'll probably do it on your own