That's a perspective that I never found offensive as a nonCatholic. We are all baptized into one body (1 Cor 12:13). During the years I studied the faith I preferred to view myself as a CCC 1267 Christian in imperfect communion with the Church instead of invincibly ignorant :)
Wow.
I tell ya, in this "one Body" of Christ, where each of us "belongs to all the others," it sometimes seems like there's a whole lot of autoimmune inflammation going on!
:o/
Peace to you!