Just as Ma suffers because she relies on Chinese cultural norms and feels unable to push back on Aunt Paula because of them, Kim "loses" at the cootie games because she also is unwilling to step outside of Chinese cultural norms in a way that would actually help her fit in. When she says that she feels like the black kids, it suggests that Kim divides people more by economic standing than she does by skin color. In turn, this implies that she believes there could be some sense of community with those kids who are poor like she is. Unfortunately, the nature of poverty is often isolating, as shown by how ashamed Kim is and how she tries to hide it from others.