Groups of people choose to define behavior as abnormal on the basis that it offends their sense of what is 'acceptable'
Social norms may be different for each generation and in every culture, so there are relatively few behaviours that would be considered universally abnormal.
Homosexuality was considered abnormal in our culture in the past and continues to be viewed as wrong or abnormal in others.
To diagnose ASPD we rely on the absence of prosocial internal standards associated with failure to conform to lawful and culturally normative ethical behaviour - Making judgments because they don't conform to our moral standards.
Strength - Real World Application
Clinical practice - ASPD - Failure to conform to culturally normal ethical behaviour.
A person from one cultural group may label someone from another as abnormal using their standards. For example hearing the voices of ancestors may be seen as normal in some cultures but abnormal in the UK
Using deviation from social norms may lead to human rights abuse
Nymphomania - Women's uncontrollable sexual desire was used to control women
Drapetomania - Black slaves running away - Control slaves
On the other hand it is used to diagnose conditions such as ASPD.