Also, it doesn't take much education to become aware of this country's long and unbroken history of race-based brutality (slavery, Jim Crow, and the War on Drugs to say nothing of the outright genocide inflicted on Native Americans). Nor do you have to be exceptionally thoughtful to recognize the resulting correlations between race and poverty that persist today. And given how deeply engrained these problems have become, saying "poor people simply shouldn't reproduce" is tantamount to insisting that entire races suddenly give up on themselves in a sweeping acts of self-destruction. Which, yeah, right. Maybe go fuck yourself?
There's another, far more decent response to systematically denigrated people who struggle mightily to raise their kids: you help them.