Nelie, here is how I handled that all the time I was PEG fed. When someone told me they felt guilty, I very sincerely told that person they had no need to, as I was not uncomfortable seeing them eat. Situation defused. Such people included my A++ caregiver husband, close friends, as well as people I knew only slightly in a social group. In all cases I took it as an expression of concern for my feelings, not rudeness. Maybe I was deluding myself.
Jordan, to bring this back to your post, although I did not experience it, I have learned that many people who go through treatment suffer depression. I have been assigned by one of my former docs to try to help a person in that situation now, so I know how debilitating it can be. I say this because your husband should possibly be on antidepressant medication. Tell his doctor. Even small things can be mountains to a person who is depressed, or so I am told.