Definition - What does Disparate Treatment mean?
Disparate treatment is the unfair treatment of certain members of a group that is protected by law. For example, if an employer treats an employee poorly because they are over age 55, then this would be disparate treatment because people of that age are protected by law from age discrimination.
Justipedia explains Disparate Treatment
Disparate treatment is a very similar concept to prejudice. It is when members of a group are treated poorly or unfairly even though this group has their rights protected by law. People often receive disparate treatment for race, religion, age, gender, etc. Disparate treatment also includes employees who are entitled to the same benefits of other employees at the company, yet do not get them. In this case, the employer is displaying disparate treatment by not treating the employees fairly and or according to their rights.