What is an "inferior school"? And less experience in what exactly?
I went to a well-known and competitive university and graduates first in my class. She went to a no-name college.
I had two years of experience in the job, and she came in just six months earlier.
She got the promotion because She. Was. Black.
I've had stupid white girls sitting around talking shit about me because I was on the telephone talking with Microsoft about a problem the company was having with their database. One of them literally said "Why is she on the phone with Microsoft, isn't she supposed to know how to do this?"
People who cannot do my job yet feel superior criticizing what I do and how I do it. I'm sure they felt they were "superior", more experienced and better qualified as well.