My mileage may have varied substantially, but “Communion” is not at all an offensive word to me, nor I think to Traditional Catholics. It’s the liberal Catholics who keep insisting upon calling it “Eucharist” (Love feast, ooo luuuuuv, ooo it’s a “people’s feast” let’s gather ’round the table). “Lord’s Supper” is theologically permissable, but a much more annoying construction because it is so popular with the Zwinglie-ite sects (who deny sacraments entirely).

If you wanna pick a fight with Catholics (or Orthodox) there is only one that matters: Is the Catholic (or Orthodox) Church the one founded by Christ, and has she the authority that (they claim) Christ gave her? If so, opinions on the Real Presence of Christ in the eucharist or what books to include in the canon, or the putatitve impeccability of Mary are completely irrelevant. If not, then there is no authority on earth to decide such questions, since no other institution on earth claims that authority.