Freeway drivers here in LA, on average, are actually pretty damned good when it comes to lane sharing with bikes. When I split Id say 8 out of 10 cars will move to the side of the lane to let me pass. I try to give them a peace sign or thumbs up if I can do so safely.
Exceptions? Well, yah- there always are some...
Most notably to me are soccer moms in their mini vans & SUV's, ppl who drive big ass trucks, and yes- friggen Prius drivers, of all ppl... x.X
Soccer moms are late picking up their kids, and they'd care less if they ran someone else's dad, mom, brother, sister, son, or daughter into a ditch doing it. It's ironic, but true.
Big truck drivers are just ego maniacs. they feel that they own the road b'cuz they're so big. They can squash us like a fly and they don't care to make sure we know it. They won't make room for anyone.
Prius drivers are just a new breed of snooty elitist crazy drivers, who drive like soccer moms, but act like they are privileged environmentalists. (Good grief.). Whenever I see a rude small passenger car, it never fails to be a white Prius cutting ppl off or speeding, driven by some angry white middle aged female. LOL