You can say that, but fact is, Biased is EVERYWHERE, Wether you chose to believe it or not, German cars are faster on German track, American cars are faster on American tracks, Italian cars are faster on Italian tracks, Japanese cars are faster on Japanese track etc.
Or maybe, the TYPE of car the cars are, says something about the country, Not perse the contry itself, But what kind of handling and attributes the cars hold, You don expect a guy to be the best in driving cars like a GT-r, then all of a sudden get in a ZO6 and make Magic do you? regardless of exp, Maybe that could be a reason...doubt it, but its plausible.
But everyone here, knows fully well that American cars are picked on the most, that's no secret. Whatever car you in, of the ame country, theres always gonna be biased no matter what.
I always try to stray from my roots, and getting into this kind of debate, thas why you don't see me Swinging On The Nuts Of British Cars.