Discriminatory traditions, policies, ideas, practices, and laws exist in many countries and institutions in every part of the world, even in ones where discrimination is generally looked down upon. In some places, controversial attempts such as quotas or affirmative action have been used to benefit those believed to be current or past victims of discrimination—but have sometimes been called reverse discrimination themselves.
Moral philosophers have defined discrimination as disadvantageous treatment or consideration. This is a comparative definition. An individual need not be actually harmed in order to be discriminated against. He or she just needs to be treated worse than others for some arbitrary reason. If someone decides to donate to help orphan children, but decides to donate less, say, to black children out of a racist attitude, he or she will be acting in a discriminatory way even though people he discriminates against are actually benefitted by having some money donated to them.[5]
Based on realistic-conflict theory[6] and social-identity theory,[7] Rubin and Hewstone[8] have highlighted a distinction among three types of discrimination: