In such a culture, a performance art piece in which the artist smears feces on his body would be seen as debasing and morally wrong, even though no one is harmed or treated unfairly. (emphasis mine)
Can anyone who is normal find that act to be something other than debasing?
The implication is that in Willingham's culture the above act is art. Art?!! What culture does he live in?
The bizarre world of the education establishment, of course.