Shouldn’t Nan be angry?

NAN: Simpson, I should generally be UPSET shouldn't I? I mean, the students STILL dislike us, and I just wasted a good hour getting BAT poopy out of the rug. SIMPSON: Yes, Mrs. Keohane. You should generally be angry. NAN: THEN WHY CAN'T I STOP SMILING?! SIMPSON: I dunno, but it also worries me that your hair hasn't moved in a good 5 DAYS.
Transcript
    • NAN: Simpson, I should generally be UPSET shouldn’t I? I mean, the students STILL dislike us, and I just wasted a good hour getting BAT poopy out of the rug.
    • SIMPSON: Yes, Mrs. Keohane. You should generally be angry.
    • NAN: THEN WHY CAN’T I STOP SMILING?!
    • SIMPSON: I dunno, but it also worries me that your hair hasn’t moved in a good 5 DAYS.