Definition of Microaggression
Merriam-Webster Dictionary defines microaggression as a comment or action that subtly and often unconsciously or unintentionally expresses a prejudiced attitude toward a member of a marginalized group (such as a racial minority).
Various sites and blogs define microaggression as a small act or remark that makes someone feel insulted or treated badly because of their race, sex, etc., even though the insult may not have been intended. These acts or remarks, when combined with others over time, can cause emotional harm.
Prevention and Remedy
The attributes and actions for prevention and remedy would depend on the individuals involved in any such incident. Without this information, it cannot be categorized.