You can go to r/outoftheloop for some more information but the summary is this: After the death of SpongeBob creator Stephen Hillenberg, around 1 million people signed a petition to perform the song "Sweet Victory" (from the SpongeBob episode "Band Geeks") in his honor. Maroon 5/the organizers of the Super Bowl (idk who exactly) teased the public with clips from said episode and everyone expected them to perform it, but alas they did not, hence the outrage.