There are many facets of categorism. Young identifies five of them in her essay Five Faces of Oppression. Expanding on Youngs work, the thesis identifies thirty specific facets. How do we know whether something is a facet of categorism or not?
The answer is that we must look to the three Archetypical facets of categorism: Prejudice, bigotry and discrimination. These three are what categorism is: Prejudice equals categorist beliefs, bigotry equals categorist feelings, and discrimination equals categorist acts. For something to be a specific facet of categorism, it must be a function of at least one of these three archetypical facets.
For example, the phenomena of “stigmatization” is often a matter of prejudice, bigotry or discrimination. Or all three of them at once. Yet, some cases of stigmatitzation are not cases of these archetype facets, and thus not cases of categorism. For example, to stigmatize a person for having murdered a fellow human being may be a case of justified disdain rather than a case of bigotry. As well as a case of reasonably negative special treatment rather than a case of discrimination.
Within reason, we should always keep an open mind and an open heart while treating each other well. To dismiss an idea, to despise a person or to treat someone in a hurtful manner may be justified, but the burden of proof is always on those who claim that it is so. The stronger the claim, the stronger the need for evidence. There should always be room for a reasonable level of preconceptions, acceptance of negative feelings and a freedom of choice.