Telling an African-American man that he is pretty cute for a Black man or that he is not like other Black men best exemplify what concept?

It exemplify the concept of Stereotypes.

Explanation:

Stereotypes is a situation where beliefs of a particular group of people are over generalized. It is the expectation people have about other group of people which could vary. For example, an expectation about the group's personality, preferences, or ability.

In the case of telling an African-American man that he is not like other black men exemplifies stereotypes about black men. That is, African-American men are ugly and not good looking generally.

this is a pretty broad question and can be a pretty lengthy answer. since 1900, women have gained a lot more rights and have become active in the workforce. with women being in the workforce, men play a larger role in family life. many family tasks are shared between men and women, whereas, women used to be the sole family caretakers.

that should get you started at least.