I had a student tell me "I lost respect for you a long time ago." Thankfully this had nothing to do with my mastery of the material. It had everything to do with interpersonal issues. I will not violate FERPA here and now; suffice to say there was an issue and the student did not feel I was being "appropriate" in my response.
Still, the idea of a student losing respect for me... Should I care? In this one case, the answer is definitively "NO." But in general, I do want to be seen at the minimum as someone who is consistent. No one will accuse me of favoritism. In that, at least, my conscience is clear in the present circumstances.
Oh, and no good turn goes unpunished, I have learned.
[Post redacted from earlier version out of concern for FERPA. I never use names, ever; still, no sense being any more than appropriately vague on the specifics]