Lupin's resentment : An inside to Snape's resentment

[potioncat]

No: HPFGUIDX 94163

Potioncat: 
> > Along that line, in a general school setting, would it be the 
norm 
> > for some students to call each other by last names? Or is that a 
> > way of showing dislike?
> 
Carol: 
> If that's the case, Draco must dislike Crabbe and Goyle. :-)
> 
Potioncat:
How could he not? ; ) 
But doesn't his use of last names in this case imply that he is 
better than them? Or is it just the way things are done?  Have we 
ever heard them address him?  Have we ever heard them speak?

(My only experience with using last names only is in the military 
and that is tied very strongly to rank.)
Potioncat