Is it time to start calling out bad cyclists?

Oh also what's with the people wearing fluro vests with the slogans like "THINK BIKE" or have "SPACE FOR CYCLING" on them, who don't have lights and ride like absolute idiots. Is that an in-joke? is that irony?

So much this. I once asked a bloke in Whitechapel whether he wore all that hi viz so we could all see what a giant bellend he was. He wasn't best pleased. The curb scooting viz brigade seem the most militant too.