People in the US probably won't say what they mean directly the same way you would in Europe. The biggest thing I've noticed in the EU is that, to an American, most people are horrifically blunt to the point of being rude. So if you're used to that you should be fine.
Unless you are very fluent in English a lot of American rudeness tends to be very underhanded, so you might not really realize it anyways? It's either that or batshit crazy.