Well, since I can't tell you to find another therapist (per your request), I would suggest telling her how you feel at the next session and getting an explanation from her as to what exactly she thought was so funny. Then, if she does not have the common sense to apologize (some don't believe it or not) ASK for an apology! It may send her into a tailspin but it's the least she can do in light of her ignorance. Sorry about your T.