OLBSLF
Only you can choose to feel attacked.
I have no sense of cultural arrogance, for example I know very little about Asia, since it is a long way away and not much covered in our press. For that matter, I know relatively little about the States too, although I have spend quite a lot of time working there.
My basic tenet is that Europeans experience cultural differences regularly, due to the amount of nations crammed into our continent and the amount of cross border trading.
Equally, one could argue that Americans are used to thinking on a bigger scale - certainly in business.
I work with many Americans and hold them in high regard as people who believe in "the art of the possible" and who will tirelessly try to work around problems to deliver a solution; in turn they lean on my experience of pan European culture.
But if you wish to feel attacked, then carry on. If you wish to believe that there is a cultural gradient, that's up to you - I see discrete cultures which are not measurable on a conitnuous scale.