A recent question here caused some confusion, and increases my curiosity about this topic. Someone asked why people say Christians have disdain for the handicapped. (Apparent) practicing Christians responded with incredulity: who says that? The point is that such an idea doesn't appear to be taught anywhere today within circles of practicing Christians. Interestingly enough, the internet is full of claims made by non-Christians that Christianity necessarily requires disdain for the handicapped, or various cruelties or brutality. That's because activists have picked up a handful of verses that by themselves could point to some kind of "ethic" for cruelty.
My question is whether the church fathers (or any more recent prominent theologians) have specifically dealt with such criticism. For example, could I find an apologetic for this question, in say, a chapter of St. Augustine's City of God? A sermon by someone like Martin Luther that advocates feeding the poor is not what I'm looking for. I want to see rebuttals of the practice of objecting to Christianity on the basis of picking a handful of tough passages.