More disturbing is that there are people in the crosswalks and the cyclist doesn't stop for pedestrians. Honking at them rather than stopping like he should. Of course you know cyclists want everything their way, their rights respected but don't have much respect for others.
I hate horns, no reason for them! We were invited on a club ride. Sure tagged along then some chick on the back of a tandem right behind us blew an air horn! WTF!

No reason for it, blew it just to be stupid I guess!
