I'm guessing there are many good resources available about DBT and the actual application of DBT skills that you could find for yourself to supplement what is happening in the group. No, he doesn't sound like a good facilitator, but you can still make it useful with a bit of research and practice on your own. Sometimes we get a bad "teacher", but if we are motivated enough to learn the material, we find ways to teach ourselves or at least supplement what is going on in the classroom.

Would anyone here be able to share some good hands-on materials that Growly might be able to use to improve her experience with DBT?