Deplorable. Risking not only their life but also that of their passenger(s) and everyone else. Really hope this is the "wake up!" call they seem to be needing.
As a point, Petrol's, though poisonous they are, they are not Cancerous, unlike diesels which provide sufficient exhaust fumes to cause the dreaded C word.
If people drove Bicycles like me this wouldn't happen, unlike some people I care about the environment. Even if you use a Hybrid, it's not the best. Fully electric is superb. I'm currently on the waiting list for an BMW i3, just because I'm better and more caring than most people.
You are lane hogging. If he were the police behind you, you would have been pulled over and fined.