It would be good if when this happens... the "revving their cars to get a reaction from you" bit, that we record them on camera phone.. then post these on Youtube.. that way there would be proof of such behavior which in most cases is unwarranted and directed solely for the purpose of revenue. Not all cops are bad, but then you get the rookies with the hero attitude that make the whole force look like.. well... cops. There are a lot of newbies out there since the recruiting boost and most of these people are not properly trained or at least not trained in the practice of common sense so it's on each and everyone of us to make sure we don't make their day.
be safe and stay legal.