scab picker
Any person who will scratch and pick at anything on their body (or yours) untill it bleeds.
scab picker
Constantly bringing up the same issue over & over (ex.racism) until people with different viewpoints get irritated and bitter.
J.Q.A. keeps bringing up how unfair it is that the Astros have no minorities on the team. He also brings up, daily, how the Cubs' fans are bitter about the Sox success. How many times can you hear the same viewpoint before you go nuts? What a scab picker!