Have to say that if I'd just read that one line about your stopping because it started hurting, I'd have thought you were being witty or as Growlycat and Anilam said, ironic, so perhaps that's what your T thought too? When you explained in this post what you actually meant, it made perfect sense to me, but I'd not have realized that for myself.

Were you able to explain to her what you actually meant? Or did her response shut you down? (I know if I were in your position I'd probably go all resentful and feel grossly misunderstood and that would made me defensive and shut down...)

My current T is big on laughing, and sometimes he roars with laughter when I'm thinking wtf???? This is not funny! The trouble is I use laughter a lot as a means of defence and staying on top of feelings (lots of ho ho hos mingled with stuff I say) and so my T probably unwittingly responds to that. Mostly I manage to tell him that it's not funny or that I'm pissed off with him seeming to make light of what I'm saying (it can be really intimidating) and he accepts that without getting defensive or trying to justify himself. But I can see how you would have felt bad at your T's response, I hope you can talk to her about it.