Why was White Fang afraid of hands?

From the text:

"Hands were things to keep away from. They hurled stones, wielded sticks and clubs and whips, administered slaps and clouts, and, when they touched him, were cunning to hurt with pinch and twist and wrench. In strange villages he had encountered the hands of the children and learned that they were cruel to hurt. Also, he had once nearly had an eye poked out by a toddling papoose. From these experiences he became suspicious of all children. He could not tolerate them. When they came near with their ominous hands, he got up."