Yes: it can be a delusional symptom of psychotic disorders.
Poussaint
Alvin F
AF
Harvard Medical School and Judge Baker Children's Center, 3 Blackfan Circle Boston, MA 02115, USA. alvin_poussaint@jbcc.harvard.edu
D006801:Humans; D011287:Prejudice; D044469:Racial Groups; D012563:Schizophrenia, Paranoid / Q000523:psychology*