The word "obedience" is a metonym for the mother herself. It is also an abstract noun that can be stated as "obey." Alternate translation: "considers his mother worthless and will not obey her" (See: [[rc://en/ta/man/translate/figs-abstractnouns]] and [[rc://en/ta/man/translate/figs-metonymy]])
This can be translated in active form. Alternate translation: "The ravens of the valley will peck out the eyes of the person who mocks ... mother, and the vultures will eat them" (See: [[rc://en/ta/man/translate/figs-activepassive]])