Well I guess that settles it then. Since you personally have never been insulted by it must mean it doesn't exist.
"I have heard from evangelical missionaries that sometimes the people they are witnessing to will identify themselves as RC to get them to stop."
How ironic that the irony of a flippant, tounge-in-cheek, inside joke, was lost on them. Its kind of like black people referring to themselves with the "N" word.
You are the first person that I have encountered that takes that inferance.