Thanks to Brian Miller at Historic Odessa in Delaware for submitting this oddball. He says it is often stated in Odessa kitchens that cooks went barefoot for this reason.
I had not heard this one before, nor had Frank Clark, food historian and supervisor of Colonial Williamsburg’s foodways program, but he said, “I can pretty much tell you from experience that would be impossible. You might not burn your feet on the hot brick, but the heat of the fire on any bare skin is hard to take, especailly when you have to get your feet up next to the fire to get out coals and the like. Plus the chance of stepping on a stray ember is constant. I do it all the time. Sounds like a unsubstantiated myth to me. I think if someone was barefoot, it was only because they had no shoes, not for any advantage in hearth cooking.”