I felt vindicated when on this one anonymous test I received a higher grade. Given all our petty biases and prejudices about race, sex, religion, size, age, party affiliation, etc. Taking things personally. One of the radical ideas is the old Postman and Weingarten's book Teaching As A Subversive Activity was that teachers be required to teach outside their specialty. Such a practice would help alleviate the problem of taking things too personally.
Teachers have a credential that proves they are highly invested in their subject matter.
But by design the overwhelming majority of students will not share a similar interest. Kids intuitively know that school is not only for learning, but sorting and selection. James Herndon know. It was Noman. Red ink is as indigenous to teaching as unreadable prescriptions to medical doctors.