I don't think most people care much for ambiguity. Everyone likes to know where they stand. Maybe some people are more "tolerant" of it because their self-concept/sense of order/whatever stands more firmly on its own, and does not depend as much on external things.

I guess an example of this would be the way the therapeutic relationship itself is kind of ambiguous. It's both professional and intimate. So it's natural to ask something like, "Does my T really care about me?" If you have a firm belief that you are lovable, maybe that question doesn't bother you as much. If you don't have that belief, maybe that question bothers you a lot, because you have to try and answer it using ambiguous, contradictory evidence in the external world, rather than with some firm internal belief.