It is called equanimity when one has no attachment with the good (the auspicious) and no abhorrence for the bad (the inauspicious). The one without duality is in equanimity-state. In worldly interacti...
For grey matter, there is no black and white. If you think in black and white, then you do not use enough brain functions.
I might act like a rhinoceros, but I'm a unicorn.