Your post contains the essential element: psychological factor.
Anyone who wants to see another group, or their own group, as superior will do so, because after a certain point the mind begins to become distorted in self-defense. This is why the objectivity is pushed aside by the emotionally biased person, because he has had at least one positive experience in life with a member of that group and wants to see and see it as a general indicator.
The best example of this is the lady in the video presented by ITALIAN 10 '' 'BBC commentator, who does not want to acknowledge the fact that what she thinks about black and white men is generally not true, because confession would only upset her emotionally.
The solution is a mental balance that allows everyone to enjoy an interracial swinger lifestyle that is free from humiliation!!