It's immoral to trivialize another person's health.
Ron is talking with James when he finds out that James has stomach problems.
Ron wants to help James cope with his stomach problem.
Ron asks if there's anything he can do to help James.
Ron says that James' stomach issues are likely in his head and that he shouldn't worry about them.
James tells Ron about foods that are safe for him so Ron can avoid hurting him.
James gets upset and accuses Ron of not understanding what he's going through.