While the term "microaggressions" has been a part of academic discourse for some time ("micro-inequities" was coined by an MIT Ph.D. in 1973), it became better known through the popular Tumblr Microaggressions.
Racial Microaggressions in Everyday Life Implications for Clinical Practice Derald Wing Sue, Christina M. Capodilupo, Gina C. Torino, Jennifer M. Bucceri,