It is important to correctly diagnose the problem. In my own experience, I had an alcoholic son. The psychologist who I dragged him to, for whatever reason, would not diagnose him as alcoholic (probably because his mother walked in and said he was an alcoholic). He said he was depressed and put him on anti-depressants. But that was the wrong diagnosis and the wrong treatment. My son was an alcoholic, and after he was arrested for a DUI, he was put in an alcohol rehab treatment center and a full 2 year outpatient program. And guess what! He turned into a productive member of society instead of a foul-mouth, lazy, wild man.
You are wracking your brain to find another explanation for his behavior, because you don't like that one. But it fits, and if you will go to Al Anon, as the girls suggested, you will learn how to deal with it.