Stuck-up

A man rushes home and from the door bellows “Guess what I heard in the bar today?”
The wife smiles and replies “Some new gossip from your buddies?”
The man nods excitedly and says “They said the milkman has slept with every woman on our block except one.” Here he gives his wife a proud smile.
The wife frowns, thinks about it for a moment and replies, “I’ll bet it’s that stuck-up Phyllis in No. 23. She hates blue collar workers.”