what was Dr. Walter E. Williams attempting to show us about prejudice and preferences? How did he demonstrate this?

He wanted to show that not always a person's preferences on a given subject represent a prejudice.

Explanation:

Dr. Walter E. Williams says that our preferences should not be determined by people's race or color, but that there are situations where these factors influence our preferences. This is because there are situations that require an individual to make a pre-judgment of people based on their skin color and based on their gender, however not all of these situations are a case of prejudice.

To demonstrate this he states that if a group was formed with 5 black men, 5 white men, 5 black women and 5 white women and it was asked for an individual, who does not know any of the members of these groups, to choose 5 people who were good in basketball, this individual would tend to choose black men. This does not mean that this individual has prejudice against blacks, or that this individual does not like women, or white men, but that in a situation where a basketball team will be formed, this individual has a preference for forming a team with black men, based on pre-judgments that were built around this situation.