One of the ongoing motifs of the movie is that violence against slaves is portrayed as cruel, disturbing, and vicious while violence against slavers is hilariously over-the-top. Compared to the geysers of blood in the opening scene this is downright restrained.
So when I went to see this theatrically, 99% of people were laughing their asses off, and the remaining 1% must have been upset about the physics being unrealistic.