The healthy/unhealthy distinction is important in online communities to prevent misunderstanding. It helps to remind us (especially newer members) that just because one person of a certain type is particularly unpleasant or disturbed doesn't mean the type as a whole is inherently unpleasant or disturbed.
I think the closest Jung got to talking about unhealthy types was perhaps this:
Naturally in saying this I only refer to those cases which occur under normal conditions. Under abnormal conditions, i.e. when there is an extreme and, therefore, abnormal attitude in the mother, the children can also be coerced into a relatively similar attitude; but this entails a violation of their individual disposition, which quite possibly would have assumed another type if no abnormal and disturbing external influence had intervened. As a rule, whenever such a falsification of type takes place as a result of external [p. 416] influence, the individual becomes neurotic later, and a cur can successfully be sought only in a development of that attitude which corresponds with the individual's natural way.