Is it time to start calling out bad cyclists?

My theory is that it's non-drivers who don't have the skills to ride safely. Not enough experience with realtime spatial problem solving and prediction. No awareness of the risks. How else do you explain nodders going up the inside of turning lorries & busses every day?

Have a friend who's a driver and a cyclist who's terrible for just riding wherever he wants to go without ever looking around himself - through red lights, changing lane etc, nary as much as a shoulder check. Seen people screech to a halt blasting their horns to avoid hitting him and he's not even noticed.

He's never taken kindly to my advice because I can't drive and thus don't know the road like he does :s