Nobody disputes that the South gets more in federal funding than it gives, but when you look at private charity donations, the South always leads the way, and that's not even adjusting for the lower per capita incomes.
Private charity donations includes church donations, and no one would deny that the South has higher church attendance than the northeast and much (not all) of the west. But there isn't always a clear line from making donations to a religious group and literally helping people in need vs. supporting building maintenance, mission trips overseas, etc.