A professor of psychology at Emory University researched microaggressions and was not sure if they really exist:
Emory University psychology Professor Scott Lilienfeld is challenging the seemingly universally accepted concept of the microaggression.
After reviewing many studies on the topic, Dr. Lilienfeld argues in his paper “Microaggressions: Strong Claims, Inadequate Evidence” that microaggressions lack scientific proof, and therefore should not be included in workplace or campus diversity training.
Moreover, he said he believes that the term microaggression is misleading, as it implies conscious intent to harm, and thus should be abandoned.