The correct answer is that southerners found wrongly stereotuping them with a biased viewpoint.
Harriet Beecher Stowe was an abolitionist who wrote Uncle Tom's Cabin in hopes of increasing anti-slavery sentiment in Northern states during the Antebellum Era. This book about slavery and the life of slaves opened up the eyes of individuals in the North about the way slavery has evolved as an institution in the South.
On the other hand, Southerners felt misrepresented in this book. Throughout it, they are portrayed as evil and horrible people. Southerners felt that Stowe's abolitionist point of view resulted in the development of an unrealistic view of slavery in the South.