It would be informative to perform a multiple regression analysis of the demographics of individuals who submit anecdotes to microaggression websites of how they have been victimized:

I'm not going to do it, but, as Yogi Berra said, you can observe a lot just by watching. From reading over examples, I would guess that common factors would seem to be:

• Female (or "'female'" or "female-identified" or "female-bodied")
• Homosexual
• The more recondite the self-described orientation, the better: e.g., a "genderqueer" is more likely to complain about being victimized by microaggressions that is a "lesbian."
• Nonwhite
• Mixed race
• Visually ambiguous race
• Belong to an ethnicity with a high degree of immigration
• But, born in the USA
• Student 
• Employed in the (nominally) helping professions, but not the real helping professions, such as nursing (see below for nurses' and doctors' attitudes)
• Disabilities
• Mental and emotional illnesses
• Self-absorbed
• Generally hostile personality

As a palate-cleanser, allow me to direct you a page of Medical Acronyms and Doctor's Slang. Examples of what doctors, especially Emergency Room doctors, write in their notes include:

• AHF - Acute Hissy Fit
• AAA (or Triple A): Ay Ay Ay. Precursor to Status Hispanicus. Wound-up Hispanic female unable to tolerate even the small discomfort of removing an adhesive plaster, but not yet full-blown histrionics.
• Acute Pneumoencephalopathy - airhead
• APRS - Acute Puerto Rican syndrome (bouts of screaming and yelling)
• Blade - Surgeon: dashing, bold, arrogant and often wrong, but never in doubt
• BVA - Breathing Valuable Air