I'm using "protected" in the sense that it is a genuine disability, recognized by modern medicine and law, and as such anyone who suffers from it is entitled to the full protection of the ADA in the US.

It also means that anyone disparaging it like that in the workplace is guilty of discrimination against a disabled person, just as if they had called someone with an amputated leg a "worthless cripple", or mocked a hearing-impaired person for not being able to hear them when they whisper in a meeting.

In the United States, 'protected" in this context means 'legally protected', in this case by the ADA. Employers are required to give reasonable accommodations to employees with disabilities.