My favourite cyclists are the ones who wear the full outfits and the shoes that clip into the pedals, who like to show off how serious they are by wearing a helmet with a camera attached to it, and then when the lights are red just mount the pavement and cut across anyone who happens to be in their way. London is full of them.
Also, not sure what it's like anywhere else TBH but there are loads of cyclists in London who ride on the pavement, some of whom get annoyed with pedestrians for having the audacity to be going somewhere on foot. It's the sort of thing that really does cyclists no favours at all IMO.