Having been brushed off (I have worked with many a crappy T) my suggestion is persistence. You might not get the answer you are looking for but keep pushing until you get an answer that fits/makes sense. And sometimes that doesn't even mean a different answer just a different T/pdoc that can understand well enough to explain why it is what it is in a way that makes sense. IMO.
My current pdoc can say and do all sorts of things I never would have been comfortable with when I was working with my last pdoc. It isn't hat she is saying anything truly new... heck she has even suggested things that *logically* should be harder to take than old pdoc! just that she knows me well enough to say it in a way that makes sense/fits.