Is it time to start calling out bad cyclists?

Indeed. So reinforcing their easily-reinforced bigoted stereotypes doesn't help solve the problem, pending the realisation of greenhell's everyone-is-judged-on-their-own-merits-at-all-times utopian fantasy.

And if one person here had been arguing "Let's all ride like cunts", you'd have a relevant point. Maybe you should hang around for someone to turn up and argue that, then you can assure yourself that it really was the point of the discussion all along.