I sat down next to a large Korean family in a Japanese restaurant last weekend, and all they spoke was English when conversing among themselves and their server. I could have closed my eyes and would not have been able to guess their nationality! On the other hand, I walk into an auto parts store, and five Mexicans are straining the patience of the entire counter staff who are trying to help them, but don't know what they want because they can't understand them. Meanwhile, I'm standing there waiting almost half an hour until the language lesson is over. Jgoins is absolutely right!