I grew up in the British colony of Hong Kong. I was a foreign born American ex-pat living in a fragment of the late British Empire that was a multicultural melange of ex-pats.
Here's what I know, every single national stereotype is totally misleading, usually wrong and has absolutely no bearing on individual members of that nationality or culture.
Human nature does not change from culture to culture....however customs do vary, and that is where misperceptions arise....also that's where stereotypes come from too.
For the record, in my opinion the British are not all socially cold, the Americans are not all uncouth, loud vulgarians, the Chinese are not all devious and greedy.....and the list goes on.
Actually, back in the colonial days of Hong Kong, English boys seemed to be really proud of having American girlfriends and American boys liked English girls. How the girls felt, I never really knew.....chicks of all kinds were a big mystery to me.