Ok, i haven't contributed to this thread yet, so i'm taking a shot in the dark and saying that i reckon Craig could have said this. It seems to have that right amount of self loathing you know? No idea what episode it's from though. Am i even close?
You are half right. Wemboy was on the right lines with the self-loathing.
Instead of Craig, it was indeed Caroline Miller. Its in the scene of 'Krelboyne Picnic' where she is sobbing to the young Malcolm. The day has been a complete disaster and she is questionning her own teaching eptitude.