I'm just going to come out on the record and say it: "Watch Me (Whip/Nae Nae)" is the "Hokey Pokey" of 2015. Think about it for a second. Both songs are "earworms" that get stuck in your head despite your feelings towards them, both have a simple and easy-to-learn dance associated with them and both songs are essentially just instructions for how to do said dance. Additionally, both songs are something that pretty much everyone stops whatever they're doing to join in on (especially children of the respective time/era that each song came out).
If you need some evidence for that last assertion, look no further than this video of the Mighty Mites children's football team from Milford, Massachusetts. They were scrimmaging defense vs. offense during halftime of a varsity game when "Watch Me (Whip/ Nae Nae)" starts playing over the P.A. system. Instantly, every kid on the field is distracted to the point that one team is able to very easily score on the other ... at which point both teams resume the dancing. This had me falling out of my chair, especially players #88 (white) and #20 (red).