That would frustrate me too. I always find myself disregarding the things they say that I already know. I like a T who specialized in something other than CBT where our sessions are less structured and things just sort of go with the flow. That way, I'm always paying attention to what's going on and not thinking about what I already know. For me, it's less of a feeling of partcipating in a specific course of treatment and more a general exploration of the relationship and how I'm changing. But mine is more a long-term thing than the specific goals that CBT is often used for. Maybe you should try a T with a background in a different theory - like psychodynamic or something. I prefer to just see what unfolds to checking off lists and behaviors - but that's just me. Good luck.