I understand how you feel here, because I see smiley symbols as very trivial, and those feelings you describe are anything but trivial. You must feel very vulnerable after that disclosure, and an emoticon just isn't an appropriate response.
A wink symbol seems particularly weird too. How are you supposed to interpret the meaning of that? A therapist should be providing clear communication, not ambiguity and innuendo.
I tend to find that when my therapist disappoints me or acts in a way that makes me uncomfortable, the real work is in the resolution.
I think it's important to tell your T how the response made you feel. I hope she is non-defensive and honest in her response. Being able to resolve bumps in the road this way is an important part of the work IMO.