I was just walking through downtown montreal today and I saw a number of bike courriers doing things that would give all cyclists a bad name. For example : one went right through a red light cutting off cars on the perpendicular traffic (who had had green for at least 10 seconds). A second was going the wrong way on one of montreals busiest streets; a motorist honked at him, is reply was a the usual hand gesture.
It seems to me that many bike courriers are doing us no service with their antics with regards to traffic rules. I do not obey all of the rules, but I do not cut off other cars when they have the right of way.