I could say "the first time is excessive" but that doesn't mean they'll stop pulling me over
While it is true that some cops do abuse the power to pull a car over for slight or imagined infractions, it is also true that cops are on the lookout for all sorts of things you and I cannot know anything about
: a gray four door ran a light and hit a pedestrian. A drunk driver was seen in a sporty blue car. A green Ford was stolen, no license plate at this time, baby in vehicle. Yes, sounds dumb, yes does happen.
So if you think it's "harassment" you do a quick fact-check of your situation- have I done anything to the car to warrant this? have I acted in a way to warrant this? If the answer is "yes", then suck it up. If the answer is "no" then you don't know why the cop did it. You just know it annoyed you. Every cop I have been pulled over by, without exception, will speak to me if I'm civil. If it keeps happening "for no reason", you contact the local pig pen and ask 'yo cop dudes, what's up with this?'. Getting snotty with the cop that did it by the side of the road will not work.