Jesus, nursery rhymes suuuure have changed since I was a kid. Guess they got Mary and her little lamb the fuck outta dodge, huh? Can't believe they got replaced by some segregative song that sounds like it's straight out of the 60's. What else have I missed? You about to tell me that 'Humpty Dumpty' is now an obese African American and he actually got pushed over the wall he was sitting on by the fear mongering Presidential candidate that had it built? Jack and Jill went up the hill before Jill told Jack her Dad said they weren't allowed to drink from the same pail of water? One, two, buckle my shoe...or it's 15 lashes come sundown? Buh-bye black sheep, we don't welcome your kind here? What fucking planet am I on? This stupid little rhyme doesn't even make sense. Why would a 13 year old own a store, and why would he/she be discriminating against black clientele in 2016? Melodic songs about absolutely nothing shouldn't be the root of so many damn questions!
Seriously though, shouldn't be too hard to get to the origin of this. Just find out which class parents own any kind of store and you've basically found the people responsible for a bus load of 13 year olds chanting racial slurs. Probably been humming that discriminatory little ditty behind the counter of their gun shop for the last 30 years. It's become so second nature that they didn't even realize they were belting it out in front of their young, impressionable child, and the next thing you know it's spread to half the student body at some school full of idiots in South Mason-Dixon Line, Maryland. The sad thing about that hypothetical string of events is that it's probably the best case scenario, because I'd rather not think we live in a world where middle schoolers have become Mother Goose's evil step children.
UPDATE: I guess it originated from this YouTube video, but I think I'm just going to stick to the story I completely made up.