Either he knows, too well, the meaning of "a good person" or does not know at all.<br />
He doesn't want to be labelled.
I'd think that he didn't think he was worthy of such an observation.<br />
I'd also disagree, but I wouldn't beat them over the head about it. They obviously feel that way for their own reasons.
because he is thinking that he is not a good person oc.
He is probably one that does not like to be bragged on, or he chooses to give God all the credit.