Are Americans more direct than Europeans specially British?

I have seen Americans are more direct. If they hate you they will show it by speech or actions or if they love you, they will show it by speech or actions.

Or the other hand, the British are always nice and polite on surface level but inside you never know what they actually want for you.

That is what I feel. I am not forcing you to make comments on the British but rather tell me about the Americans.