Men hate breastfeeding for the same reasons they hate body hair and birth. Birthing live young, feeding those young milk, and growing hair are all traits of a mammal. Men see themselves as mammals, though they see women as sexual objects. To see a woman breastfeed, have body hair, or even give birth humanizes her, forcing men to see the disgusting nature in which they look and treat women. By shaming women into covering their breasts, shaving their bodies, and never mentioning birth, they are able to see women as objects instead of people.