Character Analysis
These are old friends of Harry's from the last time he lived in this town, several years ago. Unfortunately, he's in a terrible mood when they invite him over, and insults them for the way they decorate their house.
They insult him, too, by calling him a traitor to his country. These characters, especially in contrast with all of Harry's new friends, are pretty square and represent everything Harry wants to get away from and can't.