Look, we can play this game forever.
Fact is if this is real and he is not trolling then pretty much everyone, with the right background or not, would agree he is not mentally sane. Period.
It doesn't get much clearer than a case like this.
Unless you want to be all political correct like you. Which never helped anyone, anywhere.
Sanity is a very relative term. If 'sanity' is the norm I would say from my point of view that most people are not sane
There is no monopoly on 'reality' and (almost) everyone views the world through lenses clouded by their own personal life experience
That's what makes us human
Add any label that makes your experience more comfortable and lets you believe you 'understand'