Is it time to start calling out bad cyclists?

my rule of thumb is we need to look out for the more vulnerable road users

you should be riding far enough from the kerb to give you a chance to shout at pedestrians who are strolling out (and you do have the choice in words used). rough rule of thumb is at least a car door's width away from the kerb, you will also find that in general drivers will then give you a similar clearance. this now gives you swerving options. also the further out you ride the greater vantage you have when you are passing parked vehicles so you have longer to see if there is someone about to step out

Can't agree more.

filtering at speed is dangerous when the rest of traffic is slow, conflict often arises when there is an unexpected great disparity between road users velocity

I've seen so many occasions that people cross the road using the gap between buses. One second it's clear cycle lane or filter space, the next there are two german* tourists slap dab in front of you, looking in the wrong direction.

• The obstruction is not necessarily a tourist, it could be pram shoved in your path, which is something I have also seen (you'd think a baby was kind of precious). The german tourists** were merely an example, based on a previous experience.
  
  
  

** Your tourist may vary.