What term is used when people start discriminating against each other?

The term commonly used when people start discriminating against each other is "discrimination." Discrimination refers to the unjust or prejudicial treatment of individuals or groups based on various characteristics such as race, gender, religion, sexual orientation, or disability. It involves treating certain individuals or groups unfairly and denying them equal opportunities and rights.

Are you sure

Yes, I am sure that the term commonly used when people start discriminating against each other is "discrimination." It is the widely accepted term to describe such unfair treatment and prejudice towards individuals or groups. If you are referring to a specific context or situation, please provide more details so I can provide a more specific answer.