The name comes from the barrels of soda crackers that could be found for sale in small-town stores across the American South in the early 1900s; people would stand around the barrels chatting and catching up, similar in purpose to contemporary office water coolers.
They are joking about this https://en.m.wikipedia.org/wiki/Cracker_(term)
Issa joke
That might be where the hate term actually came from 🤔