Been to many hours of DNI “training”. It depends a great deal on who the instructor is and how they set the tone. Had a two day class a few years ago that had a mixed contingent for attendees - about 6 companies sent people. One company sent 25 first line leaders and the company president. The instructor was a man hating b*&ch. An hour into her presentation this company president stood and shredded her in public then left with all the employees from his company. Every one I have been to was painful - some very and some you just do the time.