I’m sorry you have to spend your energy dealing with outrageously ignorant white people. I’m white, and i worked for 25 years at a historically Black college. I was also married to a Black woman for many years. I am grateful for the education i got on racism and being an ally. White people need to step up and be a part of responding to other white people being racist assholes. The instances you sited of the statements you have experienced imo go far beyond micro aggression to full blown outright racist remarks. Saying to someone “You don’t look like a Black person?” Or “We won’t mind taking direction from you?” It’s disgusting.
I hope that white people read your article and check to see if they have committed these sorts of workplace atrocities and make changes going forward.