It's inevitable that any relationship is going to involve difficult feelings towards each other at some point along the way. It wouldn't be real if it didn't. And a therapist being congruent doesn't obviously mean revealing all their frustrations and negative feelings to their client. It just felt to me that the T in question was compartmentalizing (there's a word!) the therapy experience to the point it came across rather inauthentic, or at least would to me. Maybe that's just my perspective.