I think that a lot of the bias originated in the 1980's, when the US made a lot of junk and the Japanese took advantage of the situation by increasing vehicle size for more appeal. It's also regional, as the coasts have embraced imports more than the interior. In the 80s coworkers had; Chryslers catch on fire in their driveway, dedicated Ford and Chevy owners swore to never buy another American car, a party when fially getting rid of a Camero that came to be called the 'Devil's Chariot', '4-6-8' Cadillacs that GM bought back, diesels that GM bought back, etc. But, people seem to easily forget the major problems that some Japanese cars had; cars that rusted out in a couple of seasons, immature rotary engine technology, low turbocharged engine life, and recently engine sludging in Toyotas. What's hard to initially recognize are well developed and/or mature vehicles, ones that end up being durable and ideally realiable too. I have the impression that I see more old full size pickups on the road than imports from the same era, but it's just an impression.
We donated our Honda Civic to charity when it had about 120k miles on it, as it was down on compression in one cylinder, needed a carb rebuild, and produced a lot of blue smoke when starting it up. We drove it hard as we live on hill and have three kids, but it didn't last like the 250k to 300k mile Accords that a few coworkers and friends have. We have a 93 Taurus with about 174k miles, and a 99 Taurus with almost 75k miles, and while the 93 has had the starter, fuel pump, wiper motor, light switch, turn signal switch, water pump, radiator, and shocks replaced, opted not to the replace the air conditioner as they wanted a $1000 to do it, we did have zero problems for the initial 75k miles. It burns some oil now but still runs well and gets 28 mpg on the highway. In our case there wasn't much choice on vehicle as we wanted the most affordable car that could seat six, which ruled out the Camry and Accord, and since we got both for $13k the SUVs and minivans weren't a consideration.