"Any bloke with a working prick would be insane not to like you" is a bold, humorous compliment highlighting the person's attractiveness and charm. The statement is meant to emphasize her appeal in a playful, candid way.
The quote is followed by a moment of surprise or shock from both sides, which underscores the bluntness and unexpected nature of the compliment. It also hints at her intelligence and wit, making her even more attractive to others. This dialogue showcases a lighthearted, teasing tone found in Stephanie Perkins' book, Anna and the French Kiss.