I'm a beginner that thinks meta-discussions are fun..

Eliezer is asking about whether we should tolerate tolerance. Let's suppose -- for the sake of argument -- that we do not tolerate tolerance. If X is intolerable, then the tolerance of X is intolerable.

So if Y tolerates X, then Y is intolerable. And so on.

Thus, if we accept that we cannot tolerate toleration, then also we cannot tolerate toleration of tolerance, and also we cannot tolerate toleration of toleration of tolerance.

I would think of tolerance as a relationship between X and Y in which Y acquires the intolerability of X.