Is it time to start calling out bad cyclists?

The best ones are where you get an audible 'tut' from behind, or even a request to let them past. Which is stubbornly refused, obviously.

I've never refused to let people past, I normally just say "where are you trying to get to?" and they point at the side of the vehicle and say "that space!" and I shout "THERE IS NO SPACE!"

Then they push past me and go and wait in blind spots anyway.