Yes, “they” can be used as a singular pronoun:
Gender-neutral
“They” is a gender-neutral third-person pronoun that can be used to refer to someone whose gender is unknown or not important. For example, “Somebody left their umbrella in the office. Could you please let them know where they can get it?”
Nonbinary
“They” can also be used as a nonbinary pronoun to refer to someone whose gender is known or knowable, but who does not identify as male or female. For example, “This is my friend, Jay. I met them at work”.
History
“They” has been used as a singular pronoun since at least the 1300s, appearing in the works of Geoffrey Chaucer, William Shakespeare, and Emily Dickinson.
Acceptance
“They” is now widely used in spoken English and is officially recognized as correct by several key bodies, including the American Psychological Association (APA), the Modern Language Association (MLA), and the Oxford English Dictionary.
Usage
It is important to always use a person’s self-identified pronoun, including when a person uses the singular “they” as their pronoun.
No.
I will not.
Chronic Dissociative Psychopathology is not listed in any gender list I have seen.
The rest is fine but this is a hard NO.
In standard English, as opposed to politicized woke English, the proper generic pronoun is “he.”
There is no such thing as “nonbinary.” These are confused people who refuse the accept there actual sex.
Although there are historical examples of its use, it was considered incorrect until the woke crowd started to force it down everyone’s throat. If they can advocate for its use, I can advocate for its incorrectness.
I do not care for what someone’s “self-identified pronoun” is. A person is either male or female according to his biology.