I was surprised to see Tonks refer to Draco as "that Malfoy boy."

I never noticed that. How weird. Even Sirius refers to the family he doesn't get on with as 'my dear cousin' or whatever, does he not? I suppose it's a neat way of distancing oneself, anyway - Tonks already going by her Muggleborn father's name, and associating Draco with his.
Although she ends up helping him in the end, weirdly enough, doesn't she? She stalls Harry inadvertently while he escapes from the RoR, iirc.