Full Idea
The demand for seeing people as equals (in some important perspective) relates to the normative demand for impartiality, and the related claims of objectivity.
Gist of Idea
The need for equality among people arises from impartiality and objectivity
Source
Amartya Sen (The Idea of Justice [2009], 14 'Equality')
A Reaction
Either impartiality already contains (analytically) the concept of equality, or the principle of sufficient reason must be invoked. True impartiality removes any reason for preferring one person to another. But what if preference is 'to my taste'?
Book Reference
Sen, Amartya: 'The Idea of Justice' [Penguin 2010], p.293