I really don't like motor bikes with cyclist. While I think those that drive cars know there are weaker ones out there, from motor bikes, to bicyclists, to pedestrians, it seems the motor riders are often too busy watching out for themselves. I hear more about motor driving defensively than I hear about watching out for others. The rate a motor bike -> cyclist dangerous encounter seems higher to me than car -> cyclist (being there are so many more cars). I have no stats, but seems the cars give more berth to a cyclist than the motor bikes.
Last month a cyclist was killed being run over by a motor cycle in a race, last week my son hit this one, after it hit another hard enough to dislodge a rear wheel.