That is unfortunate, with a more clear picture, this looks more like someone that has chosen to allow mental health to be an excuse for poor behavior rather than a reason for it. I would argue this is equally as bad.

I do not argue mental health as an excuse, I have my struggles and set backs in that arena but it doesn’t give me permission to be an awful person, I do think there is a vulnerable population that can be prayed upon due to a tendency toward credulity, or having been relentlessly bullied that now they want to find a group to belong to, and in that group they want to find some form of secret knowledge that the masses are not aware of, like a secret shadow government that is really in charge. So when they are proven right they can have a great I told you so moment they have wanted all their life.

So again I say looking in from the outside mental illness often looks the same and is poorly understood if it is understood at all even by those that live with us and care for us. From the tone that op seems to be taking they are starting to feel piled up on and is shutting down to just definsiveness. I suggest perhaps they need exposure to more people and the stigma of mental illness may be at play. I am sure many people in their life has a struggle or even a diagnosis, but it is not appropriate to talk about so they may never know.

Sorry for rambling, just really have a lot of thought on this, and rarely get to talk about it. Very much a fascinating subject.