It is not our way to discuss specific people or issues, thereby continuing the problem or even making it worse. Rather, we deal with it, inform the guilty party or parties in private, delete it and move on. Obviously someone or some folks are breaking the rules and or pushing the envelope. Bob is just warning you so you don't join in or continue. It is our friendly way of saying stop.
Now if you ever see the Grand Poobah posting in red, a more serious infraction has occurred and heads will fall. Mods post warnings in green, and sometimes we senior members post in purple. The colors are important and should be observed.