Anna Kendrick’s response to Ellory Smith’s tweet was just Anna Kendrick being Anna Kendrick.
It was in commercials, television shows, social media, radio, etc. But that’s just how popular that song was with any and everybody replicating Kendrick’s scene on social media.
Of course, young campers would be doing the full routine at camp – they were the target audience.
Without even trying, the actress managed to be funny even when apologizing over a song.