insulince
Surly/abrasive/disrespectful behavior that the actor (or family/friends/associates thereof) tries to excuse/justify due to his having diabetes or hypoglycemia.
I'm all for tolerating minor-to-moderate irregularities in someone's behavior if he has a medical condition that truly prevents his being able to perform significantly better, but I tend to draw the line at insulince, especially if said misbehaver seems perfectly capable of being pleasant and agreeable when he feels like it.