Personally, I can't believe anyone is taking this story seriously. An unidentified person relates a story concerning a ridiculous traffic stop of her also unidentified brother in law because of a bumper sticker. The stop allegedly takes place in a 96% white town of 3700 people in central Louisiana. The closest thing to a "confirmation" is that the town secretary knew nothing about the stop. Is this news? Is there any reason to believe anything at all happened? I would wait for at least a little confirmation before getting upset. If it comes, I'm sure the ACLU would be more than happy to represent the harrassed driver in seeking redress.
For what it's worth, I once received a ticket for having an obstructed rear windshield because I had a small Princeton decal on the lower left side of my rear window (behind the driver's head where it could not be seen). Discrimination? No. I was actually driving 75 MPH in a 55 zone. The traffic cop didn't want to give me a moving violation and gave me a trumpted up ticket carrying no points and no insurance implications instead. I was happy to plead guilty and pay.