Shared Writing: Psychological Disorders

One of your authors once attended a training session where the instructor shared that they did not believe in the DSM or in using diagnoses. This person believed that diagnoses were much like rumors in that they had the potential to lead toward specific beliefs and assumptions about a person. And like rumors, they may also lead to negative biases. Rumors aside, what are some ways that psychological diagnoses may inadvertently lead to prejudice? In extreme cases, how might they lead to discrimination? Are there any specific diagnoses that may be more prone to negative biases, particularly by those not familiar with psychology?