The key distinction, for me, is the professional nature of the exposure. I may refrain from choosing exposure to graphic sex or violence in my leisure time, but if such exposure is necessary or inevitable as part of my professional duties, then it should be both expected and accepted. So law students regularly read details in rape cases, ER doctors daily confront graphic injuries, and, I would assume adults studying film classes would be expected to be able to manage the films shown. It is part of the job.