He is Boorish and bigoted against American vehicles.
Well, to be objective here (though you might disagree) ... every time I get an American car as a rental I'm forced to conclude the people who design American cars are idiots.
From the ergonomics of the seating position, to the layout of the controls, to the steering and suspension I find myself thinking "why can't these people buy a Toyota or a Honda and find out how to do this properly".
I had a Dodge Avenger as a rental a few years back, and it was a terrible car; I hated everything about it. It kept finding ways to annoy me. I recently had a Camry as a rental, and it was exactly what I'd expected it to be.
I grew up in and live in North America. My father owned nothing but Chevys until he died.
But I sure as hell wouldn't own one. Because they often seem like they've been designed by a committee of chimps coming off a bender.
Maybe he's biased against American vehicles because many of them are rubbish.
I know many many North Americans who won't buy American cars.