Mistress Valentina caught this guy bullying someone else, and she had to punish him for what he had done and to make sure that he would never do it again. That is why she chose to teach him a lesson and to shit on him in a way that he would never consider pissing her off again. The mistress did not care about what he felt and made him eat shit so that he was degraded and learned his lesson in a humiliating way.