As an Israeli this was a shock for me when I first moved to the US. Here "let's have lunch sometime" is literally "let's have lunch sometime". The American culture is so indirect and giving direct feedback is so hard. One of the biggest prides in our culture here is that employees can always burst into the CEO's office and tell them they are wrong if that's the case :]
Wasn't surprised at all to see this phrase book was authored by another Israeli :)