I don't believe that the parent was even accusing the original poster of anything particularly dark on the racial front, just providing some context.
But there's a long history of racial tensions in Alabama, and nowadays one of the main ways it's expressed is through the white-dominated state government absolutely hating the city of Birmingham.* A combination of under funding and interference in local matters makes it very hard for an already poor city to prosper and, some would say, fosters a corruption-inducing urban insularity.
And now the families who lack indoor plumbing and running water? Suffice it to say that if they were mostly white, state politicians would be much more interested in remedying their situation.
Take this with a grain of salt, as I'm projecting my Georgia experiences. (I will note that Alabama is, if anything, less cosmopolitan than Georgia, so I doubt I'm being too harsh on them.)
*This is a repeated pattern through the South: compare, for instance, the Atlanta/Georgia divide. It goes beyond the typical urban/rural divide.
I can understand why you think I was insinuating that the OP was racist, but that was not my intention. My intention was to point out that his 'academic' question was incredibly callus toward a population that is regularly and systematically disadvantaged on multiple fronts. .