Remember the "Freedom Fries" fiasco? That, and a general tendency for Americans to think, right or wrong, that the U.S. pulled their cookies out of the fire twice now, only to have that favor returned with haughtiness and dislike.
I've been to France many times. They are not the warmest people in the world, but nothing horrible. Make an attempt to speak French (S'il vous plait) and they'll be cool.
As far as inbreeding, the USA has the LEAST inbred population on earth. We've got fresh genes from all over the world due to immigration. Some of the genes have combined to make some smoking hot women, so long as they stay away from the Freedom Fries!