Given the perjorative use of the contraction RC, I would suggest that it not be allowed. If it means that NYer’s post be removed, so be it, from my perspective. NYer may have a different POV, so I would invite her to post on this.
Excuse me, but that is ridiculous.
Roman Catholics have told us on this website that they take offense at being called "Roman" Catholics. Now they tell us "RC" is a pejorative when even fellow Roman Catholics use the term in reference to themselves.
If someone on the forum wrote "arse" as shorthand for "Roman Catholic," you might have a complaint. But that is the first time I've ever heard of this meaning attached to "RC." Regardless, no one here is calling anyone an "arse."
Frankly, this constant attempt to control the language is pretty transparent.
For the record, no one complained when Mark used the shorthand of "OPC." It was the use of another acronym for that organization that was offensive because it was clearly scatological. In this country.