Is it time to start calling out bad cyclists?

TBF (if you're in the middle of the lane) the amount of space left either side of you is simply too inviting for a fellow cyclists. The polite thing to do if undertaking would be to say I'm passing on your left. I draw the line at undertaking me if I'm riding on the cycle lane border.

You're not wrong... however anyone squeezing to the left of be gets shouted at. It's not ok, that's the space I use to survive unforeseen, dicy, emergency shit.