Jahoda outlines her 7 criteria but states that deviations from just 2, result in abnormality.
This sets impossibly high standards for individuals to meet, which takes a negative stance on the definition.
This may also be considered socially sensitive as if an individual is failing to meet 2 criteria, and they're deemed abnormal, this may make them feel distressed and victimised by the criteria.
This reduces the validity of the explanation.