Segregationist (noun)

1. A person who advocates or practices racial segregation, especially the separation of different racial groups in daily life, housing, education, etc.
2. A person who advocates or practices the separation of a particular group of people, such as those with disabilities, from the rest of society.

Origin:

Early 20th century: from segregation + -ist.

Examples:

1. The segregationist policies of the South were widely criticized for their discrimination against African Americans.
2. The segregationist movement was led by politicians and activists who believed in the superiority of one race over another.
3. The segregationist argument was that different races should be kept separate in order to maintain their cultural purity.
4. The segregationist laws were finally overturned by the Civil Rights Act of 1964, which prohibited discrimination based on race, color, religion, sex, or national origin.
5. The segregationist attitude was prevalent in many parts of the country, and led to widespread protests and demonstrations by civil rights activists.