Atticus is not only criticized by the town because of his parenting, but also how he spends his time. Unlike all of the younger parents who are more adventurous spending their time outside of the house, Atticus prefers to stay at home and read. The town also criticizes his parenting, because he is so laid back and doesn't discipline his kids enough. He also doesn't force his kids to act a certain way and follow gender stereotypes that were common. During the time that this story takes place, it was normal to force genders upon kids, making them act a certain way. So for Atticus to let his daughter run around with two boys in whatever clothing she liked doing things that only boys were supposed to do, was simply unheard of. When Aunt Alexandra comes into the picture, she expresses her opinion clearly about Atticus's parenting and tries to make changes. However, Atticus knows what he is doing and has grown a very strong relationship with his kids that continues to build as they grow older.
"...You want to grow up to be a lady don't you?"
"Scout, I'm tellin' you for the last time, shut your trap or go home—I declare to the Lord you're gettin' more like a girl every day!"