I’m not speaking for NL here, but only for myself.
If RC seems offensive to some, it probably is because of its use contextually on this forum. I have read “RC” here on this forum in context with denigrating comments, so the expression has now become associated with an attitude of criticism and often contempt.
I live in a large family community of Catholics and in my large parish community and in both we refer to ourselves simply as Catholic.
Yes, Roman Catholic identifies us with the Latin/Roman rite, but when we are among ourselves we don’t commonly use that term.
Whereas on this forum, as I have said, “RC” is often used in posts that are intended to show opposition to us; it’s easy to see and discern the purpose as intended to point (negatively) to the hierarchial structure of our Church.
OK, I never want to use a naming term that someone doesn't like. But a funny thing, on other threads I have used the term "RC" because of objections by Orthodox posters. Their issue is that Orthodoxy is every bit as "Catholic" as Catholicism in the common sense. So, if the issue is something like the Immaculate Conception, then some Orthodox don't like being lumped in under "Catholic". It can get a little confusing sometimes. :)