Are Germans ruder than the British? Are Britons more dishonest than Germans? Fortunately, we don't have to rely on blind prejudice for answers. Serious academic research has been done on both sides of the North Sea.
There are Britons in Berlin who get taken aback by the directness of Germans. And there are Germans who get really annoyed when Britons (and Americans), in an effort to appear friendly, say things they don't really mean. Some Germans call this "lying".
So, what do the experts say on the matter?
(Apparently I'm part German.)