Why does Johnny feel so different about the Laphams in Sec 2, chapter 6?

By the end of Chapter 2 Johnny has his hand horribly burned. Mrs. Lapham is meaner to him, and he has to do the menial chores that used to be assigned to Dove and Dusty. One day, Mr. Lapham pulls him aside. He explains that while Mrs. Lapham thinks it is too expensive to keep Johnny around, he can stay as long as he likes. However, he should try to find a new trade that he can do even with a deformed hand. Mr. Lapham also asks Johnny to “forgive Dove like a Christian”

Source(s): http://www.gradesaver.com/johnny-tremain/study-guide/section2/