You are not wrong about the reverse culture shock. I recall one time when i was hanging out with some old friends after being out of the country for a decade and I had to be warned to not say some of the stuff that I was saying because it was now considered offensive despite the way that it was the same way that all of us used to speak "back in the day." It seems that since i left everyone has become ultra-sensitive and humor is something you have to be very careful with. I'm not a fan of that.