I have this same issue.  Or they assume I am student staff - fat dude asked me in the elevator why I was heading up to the top floor of our building and I told him my office was up there.  His eyes got big and then he was quiet. I used to care and think I should cut my hair off and try to wear even more masculine formal clothing than I already do (business school) but one day just decided to say fuck it, I have publications and good evals, use my CV and not my picture to judge me.  My husband likes my hair long lol.    Also seriously how many fat former female PhDs are there in the humanities now for fuck’s sake?  “Let me introduce you to my grad student, Bertha — she gets grease on all our qualitative data.”