Prior discussions with my law enforcement friends/relatives indicate that at least in WI, IL, MI, KY GA,and OH you can be cited for impeding "existing" traffic flow if you are playing the slow poke left lane hog game. Driving is is not a right and your concern as a driver should be safety for all, not rules enforcement.
Signs on the inter-states and many 4 lane highways instruct slower vehicles to "keep right".
To me it's all about safety, not road rage or to prove a point.