Whether you are actually being dismissive or not (in real life or in therapy - doesn't matter), I don't believe there is anything wrong with you. Nor that you are being overly sensitive. You are coping the best way you know how to.

What strikes me, however, is that you feel judged after her comment. I believe this is worth exploring with her. In other words, I would discuss with her the impact of her words and to address whether she meant it the way it came across, i.e. as a judgment.

This could lead to a productive discussion. She could 'learn' how to better support you.