The world is not black and white. There are only various shades of grubby.
WHAT ELSE DOES THIS GUY DO THAT MAKES 'SPITTING IN OUR FOOD' A GRAY AREA FOR HER?
Madness string 2472
It turns out your visual system has really strong views about whether faces should be inside-out or not, and it's willing to execute a hard override on perception if it doesn't like what it sees.