Based on my experience, it's not uncommon for therapists to not only have no clue about transgender issues, but to not realize just how ignorant they are. The ignorance I can forgive, as society is full of utter misinformation on the subject, the refusal to learn I can't.
The first person I was referred to for gender therapy had some narrow and antequated ideas of what being transgender was about, to the point that she couldn't really hear what I was saying. I supposed I could have stuck around and tried to re-educate her, but why should I be paying for her education? Nor was I willing to waste my time.
My current gender therapist was someone recommended by our local LGBT center, and she's pretty good.