Final answer:
Segregation is an example of a retrograde attitude as it is harmful and perpetuates inequality, shown by historical examples and sociological research.
Step-by-step explanation:
Segregation is indeed an example of a retrograde attitude. To understand this, we look at the sociological research of Kenneth and Mamie Clark, which conveyed that segregation was harmful, not beneficial. Segregation promotes the physical and social separation of groups based on differences such as race, which perpetuates inequality and societal harm. De jure segregation, being enforced by law, as well as de facto segregation, which occurs informally through societal behaviors and traditions, both reflect outdated and regressive values. The struggles against segregation during the Civil Rights Movement, most iconically represented by figures like Rosa Parks, illustrate the fight against these retrograde attitudes. While legal cases like Brown v. Board of Education successfully challenged de jure segregation in the United States, de facto segregation continues to be a challenge. This is due to deeply ingrained societal behaviors and cultural norms that can perpetuate segregation outside of the scope of law.