I can't imagine anyone's references not standing up for the person in question.
Like, if I had to provide a reference, I wouldn't use anyone I thought would give a dubious reference. Likewise, if I were giving a reference for someone I knew it's unlikely I'd speak ill of them unless they were so f***ing crazy I never hung around them anyway. If they were that level of crazy I don't know what I would do, because it'd be at the level where if you talked shit about them they'd show up drunk at your door and demand a reason and a recant.
This whole idea is just spitballing nonsense- there isn't a psych litmus test for this, and the tests that are out there take an extended period of time to administer and years of schooling to be able to interpret correctly.