As I said earlier, it would be wrong for me to participate in a ritual in which I do not believe -- that is why I no longer take communion in the Episcopal church (in which I was raised), since I no longer acknowledge the validity of Anglican Orders. And given what you have said on this thread, it would be wrong for you to participate in a ritual in which you do not believe.
But it would be silly for me to be offended because, say, I'm not allowed into a Mormon Temple. That's their belief, and it's their church, and it's their call. Nothing "holier than thou" about it.
Sure there is.
That a church refuses communion or even to admit a person they consider a pagan or unbeliever is NOT a "holier than thou" attitude is unreasonable. That is EXACTLY their view of those they are rejecting.