((((internettie)))) That experience sounds so hard to bear. I think I would have felt similarly to you.

I don't know what the roles of the therapists are in your group, and I am not familiar specifically with DBT. Lately there have been a couple of posts about group therapy here that do not make it sound very therapeutic to me. I'm not sure I really understand it. Is it a bunch of people getting together and letting it all hang out and being insulting and objectionable to each other? And from this people are supposed to learn to develop thick skins ("it's about them, not you")? Or is it a chance for rude people to get their heebie jeebies out of their systems by acting out? Do it in group so they don't do it in real life to the ones they love?

Remember, you don't have to do therapy, you can drop out at any time. That is one of the things it always says very prominently on the informed consent forms we have to sign at the beginning of therapy. You are not stuck in this group. I think talking to your therapist is essential before risking going back to group. Maybe he/she will somehow reframe this for you and convince you to stay in group, but I don't think you should go back until you have let your T know what is going on.