There are always exceptions, but the few times I have interacted with Biker Cops I found them to be rather cool.

First was MoTown, about '68 or so, 4th of July.  A buddy and I went to see the fireworks show over the river.  Came in high and rode my Twinjet down the stairs to the riverfront.  After the event we were riding out with the pedestrians at pedestrian speed 'til we got back on the streets.  Broke free from the people and hit over 10,000 RPM accellerating away -- and heard the Biker Cop who was directing traffic yell at me:  "Wind it Out!"

Second and last time was in a field in Harbor City on my Enduro, practicing dirt maneuvers where I had medical help readily available.  Cop on a Harley rode over the dirt to us, very appoligetic, nodded to the apartment buildings overlooking, explained how She always called and he has to roust us.

And now I'm late for work....

i ride through dallas in the hov lane when i commute to work. they always return the wave, and at different times i've had a polite "escort" into town.