Interested thread. In my experience there is definitely bias. The vast majority of my bad interactions with drivers were when wearing bike gear and riding solo on my folding road bike, either with or without my high visibility neon backpack...though generally worse when not wearing the backpack.
Same commute on my 20 inch folder wearing little bike gear and a black backpack resulted in almost no bad interactions. The more you look like the guy who lost his license the better.
Tandem with the wife, a few issues here and there. Tandem with the wife and trailer containing our pooch, zero issues.
Worst behavior, group rides.