SI is a pretty common target behavior for DBT Ts. When I showed my T mine when I first got in (didn't need stitches but I had a lot of shallow ones), he didn't seem flustered. It became the primary target behavior to work on and that's where we went from there. I've never been shamed, judged, or treated harshly because of it. In fact, my DBT T was the first to recognize that I was just trying to cope and managed to reassure my family and friends that it wasn't cause to put me IP.