The Pharisees and scribes ask this question to express their disapproval that Jesus' disciples are eating with sinners. Alternate translation: "You should not eat with sinners!" (See: [[rc://en/ta/man/translate/figs-rquestion]])
The Pharisees and scribes believed that religious people should separate themselves from people they consider to be sinners. The word "you" is plural. (See: [[rc://en/ta/man/translate/figs-explicit]])