No one mentioned teaching portfolios in the professional-development seminars I attended as a doctoral student, so when I encountered requests for that item (or the vaguer "evidence of teaching effectiveness") in a handful of job calls last year, I balked.
Microaggressions are defined as "brief and commonplace daily verbal, behavioral and environmental indignities, whether intentional or unintentional, that communicate hostile, derogatory or negative racial slights and insults that potentially have harmful or unpleasant psychological impact on the
target person or group." (Solorzano, Ceja, & Yosso, 2000)