One Piece Chapter 24, page 15: Things That You Can't Lie About

Clahador sneers, saying Usopp certainly lies well. He then coldly says, "I'M NOT SURPRISED THAT YOU TURNED OUT THIS WAY. YOU'RE THE SON OF A FILTHY PIRATE." Usopp's expression turns to shock and anger. Luffy, Zoro, and Nami look on in surprise as Luffy asks, "HIS DAD WAS A PIRATE?" Clahador continues his verbal assault, telling Usopp to stay away from Kaya because they belong to totally different worlds, asking if it's money he is looking for and telling him to name his price.