Harry=halfblood?

[yairadubin]

No: HPFGUIDX 76037

How come no one refers to Harry as a half-blood?  If his mother is a 
mudblood, as Snape's statement seems to imply, then Harry should be 
referred to as a half-blood. However, on the train to Hogwarts in 
PS/SS, Malfoy tries to warn him not to hang out with mudbloods and 
Weasleys - as if he's better than that. Considering the fact that 
Harry is exceedingly famous, it seems logical that the WW would know 
his lineage.
                               *Yaira*