I always say we have the worst drivers here in Vegas. I see people blow red lights all the time, try to change lanes with a car already there. I even had a kid tell me he was 17 for an excuse to blow through a stop sign and speed through a housing community.
With that said, since I started commuting by bike , I've seen some of the most polite drivers. Only twice, I had someone almost right hook me. And that was the same day, about 500 feet apart. Most times they wait for me to pass. Sometimes, they were overly polite. They would have plenty of time and space to pass and still follow slowly. Even though I see this, I still ride defensively. As if they don't see me.