Is it time to start calling out bad cyclists?

This is really annoying. However, one problem is that it's really difficult and dangerous to try to "speak" for other road users. If you stop behind a car to wave them round the corner then you risk another cyclist hammering past you and getting left hooked. It only really works if the gap is narrow enough for you to physically prevent other cyclists from getting past.

It should work if peeps are paying attention.