Satire is defined as the use of irony, sarcasm, ridicule, or the like, in exposing, denouncing, or deriding vice or folly.
Feuding doesn't necessarily fit into that definition of satire, but there is plenty of feuding in chapter 30 as the king and the duke attempt to blame each other for the fiasco that resulted in their loss of all the money they had hoped to steal. They use backhanded compliments to make fun of each others' abilities and accuse the other of ruining the plan through overacting and/or gullibility of the character being played during their attempt to be the long-lost Wilks brothers.
Both use irony in trying to blame the other for the creation of the story that the "niggers" had stolen the money.
"Mf! And we reckoned the niggers stole it!" That made me squirm! Yes," says the duke, kinder slow, and deliberate, and sarcastic, "We did." After about a half a minute, the king drawls out: "Leastways - I did." The duke says, the same way: "On the contrary - I did."
By the end of the chapter, however, their arguing has been washed away in the warmth of their liquor and they are again best friends while they slept and dreamt of their next scheme.