Representation Bias
From Categorism.com
Mistaking representatives of a certain subset of a category for representing the wider category as a whole. For example, a psychologist may not meet any mentally healthy individuals from a certain minority – yet believe that his experience of mental patients from that minority is an experience of how people from that minority group are in general. (In Swedish: representationsbias)
When applied to a category of human beings, this is a facet of categorism.
