In Gulliver's Travels, how does Gulliver react to the Yahoos? Why does he react so violently?

In the fourth part of the book in Gulliver’s Travels, Gulliver reacts to the Yahoos in a state of disgust and with the attitude that he can’t believe he is anything like these “creatures”. Quoted from the book as saying “My Horror and Astonishment are not to be described, when I observed, in this abominable Animal, a perfect human Figure; the Face of it indeed was flat and broad, the Nose depressed, the Lips large, and the Mouth wide: But these Differences are common to all savage Nations, where the Lineaments of the Countenance are distorted by the Natives suffering their Infants to lie groveling on the Earth…(172). Gulliver feels that the Yahoos are barbaric and filthy beings. He sees the Yahoos walk differently; they walk more like an animal. Yahoos also have long fingernails and toenails resembling claws(178). He observes Yahoos as a sort of servant or slave to the Ho...