What does Judges 9:16 mean?

Jotham continued, 'So, if you really acted with honesty and integrity when you made Abimelech king, and if you treated Jerubbaal and his family right and paid him back for all he did for you—' Judges 9:16 - Modern Text Bible

(Jotham turns the story back on the people, challenging whether they truly acted justly in making Abimelech king, especially after all Gideon (Jerubbaal) did for them.)