Is it time to start calling out bad cyclists?

riding north over waterloo bridge along the closed lane bit and a girl on a big town bike pulls right out in my path. I saw it coming so had slowed down, but when I said "woah! look!" she said "yes, I saw you".

Well if you've going to ride like a cheese-eating surrender-monkey, you've got to expect people to assume you're irrelevant to their trajectory...