This is Madness
A definition of madness:
Madness is experienced when one can find no link between one's own subjective reality and another's.
Or, to refine it further:
The larger the distance perceived between one's subjective reality and another's, the greater the impression of madness.
Of course, because reality is consensual, ‘madness’ is often just a measure of how far one has strayed from the herd.