While I obviously didn't go to knife & fork, I know a bunch of CWOs and LDOs who did. All were commissioned with much pomp and ceremony at their last enlisted command (good for the troops morale to see an E make O) and all were treated like officers at knife & fork. Yes there were some "lectures" and "counseling", but these included "Sir" and did not include those little extras the DIs so love to give officer candidates.
Like FlyinSpy, most thought it was a joke. And I doubt most CWOs or LDOs would have put up with a DI in their face even if their commission did still had wet ink.
When I was AOCS, they kept kept knife & fork well separated from us. We would see them marching with our DI and we were always amazed at how human, patient and respectful he was. Of course we dreaded seeing him immediately after he got done because we had to pay for all his frustration with the CWO / LDO mistakes.