Actually deli, in the clinic where I work -- an OCD clinic -- that could easily be categorized as OCD with aggressive obsessions / harm avoidance compulsions (but since it only occurs during a depressive episode, it might be an OC symptom of MDD, potentially -- BUT MDD can make OCD worse, so..). OCD, especially this type of OCD, is often wrapped up in feelings of guilt. I know that in the moment you see it as rational, but the fact that you now can recognize that it's absurd is all that's required for the "insight" criterion of the dx.

Not that I'm going back on what I said -- the most helpful thing is probably just to monitor the thought like austin-T said, without trying to categorize it. Still, you might be right. He might have been stopping himself from saying OCD.