Critical mass doos and donts?

I think the hundreds of dickheads who ride on pavements, straight through pedestrian crossings and the like, day in, day out do far more to harm the "cause" of cycling in London than a motley collection of crusties, trustifarians, reinsurance lawyers and lycra clad pony tailed Germans riding slowly around central London once a month.

I think both of them harm the "cause", and both of them should be considered just crap.