I'm sorry, but this is the "haters gonna hate" defense. It's just a blanket assertion of bias without any sort of attempt to refute the actual charges leveled against her.
Diane Ravitch asks, "What will this revelation mean for Rhee's campaign to promote her test-driven reforms?":
Her theory seemed to be that if she pushed incentives and sanctions hard enough, the scores would rise. Her theory was right, the scores did rise, but they didn't represent genuine learning. She incentivized desperate behavior by principals and teachers trying to save their jobs and meet their targets and comply with their boss' demands.
Earlier analysis by Dana Goldstein here.