According to Ribeau et al. (1999), if a European American man talks with his African American coworker only about sports and music, he is engaging in:.

negative stereotyping

Explanation:

Stereotype: In social psychology, the term "stereotype" is described as an over-generalized and fixed belief about a specific class or group of individuals. Therefore, when an individual is stereotyping someone then it represents that he or she has a whole range of abilities and characteristics that can be assumed about the members of that particular group have.

Negative stereotyping is referred to as an individual's characteristics or traits, that is being negatively attributed and valenced to a specific person or social group.

In the question above, the given statement represents negative stereotyping.

its so obvious. its 999 obviously.