How do we make it clear to this manager that he’s creating a hostile work environment?

Q: “I’ve been counseling a manager who refuses to take my advice and who I think could be headed for a hostile work environment charge. The manager ‘inherited’ an administrative assistant from his predecessor. She’s been there for 15 years; they’ve been working together for the last six. Everyone else loves her; she’s hardworking, efficient and has the best interests of the organization at heart. He refuses to talk with her when he goes past her desk to get to his office. He requires her to schedule a meeting, which he then blows off or cuts short. He complains she screws up his calendar, but he’s the one not showing up for meetings or rolling in late. He frequently asks her when she’s going to retire (she’s 63). What more can I do?” – Anonymous, Washington