Example A: If you're struggling with self-harm, one of the "aversive consequences" (I shouldn't have used negative reinforcements because they're two different things. Aversive consequences would be a more suitable term for this) would be that if you were to indulge your urges to use those behaviors your consequence is not being allowed to contact your therapist for x number of days.

Example B: Not completing homework assignments leads to negative feedback from group facilitators: acting cold and irreverent.

Example C: Storming out of a session = client is "grounded" from therapy and is not allowed to attend x number of sessions.

Those are harsher examples I have heard from a handful of people who have experienced these techniques. I'm sure the majority of DBT practitioners use positive and intermittent reinforcement much more frequently since a lot of people are reflecting on their experience in a positive light. But it is a tactic that is used as a treatment approach.