Is it time to start calling out bad cyclists?

There was a cab driver today who gave me (and other cyclists) loads of room, drove at a considerate pace when he was using the same lane as us, stopped in good time in front of all ASLs, and didn't cut anybody up or do anything at all to indicate that he was a fucking maniac.

I kind of wanted to go and knock on his window and thank him for being genuinely considerate but I didn't want him to think I was being sarcastic.

I do this more than you'd think. People really seem to like it.