Hm, well, I do sympathize with Draco in that situation, because if it were me I'd be doing the whining + a side of homicide. Don't know if you've read the fic yet, but it is an embarrassments galore situation. :P

I guess the fic also works for me because it's Hermione's POV, and I saw her as doing this whole 'Oh, Draco is acting so childishly' when she's actually repressing her own absolute mortification about the situation by trying to spin it - to herself - as Draco's overreaction, when it's actually kind of a situation where he's completely justified for exploding. (Embarrassment galore). XD

So, that was my take on things, in that Hermione's narration was meant to be read as unreliable, because we do see in the fic that she's trying to spin the situation to herself. :)