Indeed, it is not uncommon for slaves even to fall out and quarrel among themselves about the relative goodness of their masters, each contending for the superior goodness of his own over that of the others. At the very same time, they mutually execrate their masters when viewed separately.
 Frederick Douglass, Narrative of the Life of Frederick Douglass, an American Slave (1845). copy citation

Context

“They think their own better than that of others. Many, under the influence of this prejudice, think their own masters are better than the masters of other slaves; and this, too, in some cases, when the very reverse is true. Indeed, it is not uncommon for slaves even to fall out and quarrel among themselves about the relative goodness of their masters, each contending for the superior goodness of his own over that of the others. At the very same time, they mutually execrate their masters when viewed separately. It was so on our plantation. When Colonel Lloyd's slaves met the slaves of Jacob Jepson, they seldom parted without a quarrel about their masters; Colonel Lloyd's slaves contending that he was the richest, and Mr. Jepson's slaves that he was the smartest, and most of a man.” source