I say all this to demonstrate that bias was alive and well even back in the stone age of my youth. And it appears to be alive and well today, too. Female professors score lower on evaluations than their male counterparts: http://www.npr.org/sections/ed/2016/01/25/463846130/why-women-professors-get-lower-ratings?utm_source=facebook.com&utm_medium=social&utm_campaign=npr&utm_term=nprnews&utm_content=20160125. Read about the two experimental designs and their conclusions.
This takes me back to the post at the beginning of the week when I discussed student comments and evaluations. A large part of my effectiveness as a teacher is measured by these very flawed instruments. I am compared to other instructors. Unfortunately, there are no other professors of Library Science who are evaluated using this instrument except for my colleagues in the department. Accordingly, we are compared to teachers from other disciplines, rendering this whole exercise pretty doggone inaccurate at best.
And look at yesterday's post. Here is some bias as well. I know there will always be some bias. We cannot control for it all. But when gender becomes a bias, when grades interfere, when extraneous factors come into play: maybe it is time to channel our energies into something that might actually have a positive impact on learning?