[...] the South Americans coming up in one of the caravans who were given free food and shelter by the Mexican government and they complained that they didn't like the food and threw it away.
Ok, I'm going to level with you: that sounds like 100% bullshit rage bait - did you hear it on AM radio in flyover country? Do you have any source of this tale at all?
God damn, it's been a while since I've crossed paths with an honest-to-god rube! Keep on keepin' on, you flickering bulb.