The psychological analysis fallacy? The psychoanalysis fallacy? The pop psychology fallacy?
1. Opponent A is x (some trait, e.g. callous, or does not feel some emotion).
2. Being x is bad. Or it is an indicator of the lack of mental health. Hence, opponent A is not rational.
3. Therefore his arguments are false.
It seems to be a form of the ad hominem fallacy, but could also be considered to be a form of "poisoning the well" too?
