You don't get it.
"drmilled" is a performance art collective that began in Houston back in 2002. This is their longform "Confused, Angry White Guy Lashing Out" installation.
Their previous projects include Fixation, a one-off in which a man nailed his scrotum to the cobblestones of Red Square on Police Day as a protest against oppression

and Deborah de Robertis' famous human re-enactment of Courbet's "The Origin of the World" at the Musée d'Orsay.

Just enjoy the art.