The cop may not be wrong in giving that ticket, but cops aren't robots (or aren't supposed to be). They need to exercise good judgment: Was that lane change a serious offense where someone can get hurt? Or, maybe it was just a simple mistake? Heck, the OP mentioned that someone behind on the next lane let him go ahead, so where is the harm in that? That is why that cop is a dick, and why that's a bs ticket.