Is the DBT and CBT part of the requirement for your treatment? It works best in conjunction with individual therapy so you can get the emotional stuff out there as well. If you don't have a good group leader it probably isn't very helpful but maybe your individual T can help you with it. It's hard if you can't use one of your own coping skills, but there must be a medical reason behind why it's "forbidden". Just like you can replace unhealthy coping skills will other unhealthy ones, you can also replace them with healthy ones. I do agree that presented the wrong way, some techniques sound silly but they are based on actual results. Maybe if you can do some readings on DBT that will help so you don't get too turned off. I've attended groups in the past and lead some groups now and I try my best to avoid stuff that will get me nothing more than eye rolls.