What is the term for unjustifiable negative behavior toward a group and its members?

The term for unjustifiable negative behavior toward a group and its members is discrimination. Discrimination involves actions that treat individuals or groups unequally based on characteristics such as race, gender, religion, or sexual orientation. It manifests in various forms including social exclusion, verbal insults, or denying opportunities based on these group affiliations.

This is distinct from prejudice, which refers to unjustifiable negative attitudes or feelings toward a group without necessarily involving actions. While both concepts are related to bias and inequality, discrimination specifically emphasizes the behavioral aspect rather than just the emotional or cognitive stance. Stereotype pertains to generalized beliefs about a group, which can be either positive or negative, but it doesn't inherently imply any form of action. Ingroup refers to a social group with which an individual identifies, and it is not used to describe negative behavior toward others.