Is it time to start calling out bad cyclists?

I got called out by a shopper lady today when she undertook me just before a junction I intended to turn left at, preventing me from getting on the utter left hand side of the road.

When you think about it, so many of the problems we have on the roads are rooted in this belief that cyclists should be as far left as possible. It's either cars pushing you into the door zone, or it's idiots on bikes merrily undertaking or hugging the gutter before making a kamikaze turn across several lanes to turn right.

Twats, the lot of them.