For the record, the Orthodox Presbyterian Church uses OPC as throughout its website and its church website is www.opc.com. You have no objection here.
Which Catholics use the term RC to refer to themselves? I am aware of none.
If you wish to become acquainted with the antiCatholic terminology of the 1800s and early 1900s, I would be happy to be your guide.
Mark, the Religion Moderator already answered that question in a direct post to you here in POST 2663.
Did you miss it? Most of us didn't.
And what, exactly, is the point of dredging up old offenses?
If people have forgotten about them, why keep reminding of them? Why keep picking at that old scab?
If Protestants are being expected to forget Roman Catholic Church history like the Inquisition, etc, because they are in the past and over and done with, why not like the past be the past and the whole RC thing be over and done with?
Why keep making an issue of it?