Well, same difference really. An other-regarding 'status slapdown' emotion can be described fairly easily as a low-intensity mixture of outrage and contempt, both of which are well-known emotions and not "undescribed" at all. It could be most pithily characterized as the counter emotion to loyalty or devotion, which involves an attribution of higher status based on social roles or norms.
I don't think either of those work. The situation in which this applies, according to Eliezer, is quite specific: another person makes a status claim which you feel is undeserved, so you feel Mysterious Emotion X toward them. It's neither chronic nor low-grade: the context here was of HJPEV schooling his teachers and the violently poor reception that met among some readers of HPMOR. (For what it's worth, I didn't mind... but I was once the iniquitous little shit that Harry's being. I expect these readers are identifying with McGonagall instead.) He's ...
Todays xkcd
I guess there'll be a fair bit of traffic coming from people looking it up?