It’s a constant effort to ensure journalists, including writers at “progressive”, reputable and even “venerable”publications, use correct language when describing people who have been diagnosed with a mental illness.
The “people first” language guidelines ere greatly expanded in the midst of the terrible, initial (and subsequent) reporting about HIV/AIDS. Calling everyone with an illness a “patient” diminishes greatly (or completely demolishes) our agency as individuals and raises questions about our veracity and reliability. This also implies we are not believable sources or reliable narrators.
The AP Stylebook added guidelines about reporting on people diagnosed with mental illness in early 2013. http://www.ap.org/Content/Press-Release/2013/Entry-on-mental-illness-is-added-to-AP-Stylebook.
And, there are expanded resources for those journalists interested in fair, accurate, and responsible reporting on the topic:
Journalists and other writers can find plenty of other resources and guidelines online and from professional writers organizations.