Please, it's incorrect to draw "mentally ill" from this.
Mental illness is a very common, serious problem of society which deserves genuine attention. What you described are not symptoms of mental illness.
Mental illness is a very common, serious problem of society which deserves genuine attention. What you described are not symptoms of mental illness.
"A mental disorder or psychiatric disorder is a psychological pattern or anomaly, potentially reflected in behavior, that is generally associated with distress or disability, and which is not considered part of normal development in a person's culture. "
http://en.wikipedia.org/wiki/Mental_disorder
Regardless, my assessment of his mental health is irrelevant to my argument that he has no credibility for other substantial reasons.
Then don't include it. You're not a health specialist and it only weakens your argument.
Fortunately having a weak point in an argument doesn't nullify the whole thing.