If the problem is that we think that those in communion with the Holy See have something good that other groups do not have, then I can't help it. That's what we think. Why else would one join the Catholic Church, for the guitar Masses?
In comparing eating in an unpleasant place to eating in the dining room, I wasn't so much characterizing the others groups as I was trying to say that one can be nourished without getting the full benefits of a meal. You seemed to be insisting that we were saying you were lost. I was trying to explain how one can think someone has the essentials but not the full benefits of a thing.
But, as I say, those who want to have their feelings hurt will tend to have their desire granted.
You know what this is like? It's like trying to explain to a homosexual that even if it WERE true that they have an inborn or otherwise blameless in origin desire for homosexual activity, it is still wrong by using the analogy of kleptomania. They get all huffy and say, "You're saying I'm like a thief!"
"Well, yeah, in a certain sense, maybe I am. If any argument which supports my point is going to be taken as offensive, then I guess you're going to be offended," is what I reply.
Guitar Masses? I can think of many reasons to join the Catholic church that doesn't necessarily reject other Christians. The Catholic church has history and ritual to it that many find comforting. It has well-established teachings that are clarified and expounded on to the finest detail. It has a worldwide network and hierarchical structure that can answer questions about faith as good as humanly possible. But it also has well-publicized moral and ethical failings that preclude it from being perfection on Earth.