Whether or not he meant to his comment illustrates the problem perfectly: those with the means to do so can eat healthy food and absorb the cost/time/distance inherent in that, those that cannot will suffer and chose whatever they can get. Good healthy food at a sustainable price is hard to come by in the US. There are food deserts everywhere. Good food is treated clearly as a lifestyle luxury. Let them eat cake indeed.
I get where your comment is coming from, but I think they acknowledged that their situation is somewhat privileged. Quote: "All because I can afford to."
It's the old adage about it being expensive to be poor, only in reverse.