The creator of a “FUCK the LAPD” shirt sold out not only his entire stock of that shirt but also sold out many of his other designs after the Los Angeles Police Department Foundation made an intellectual property threat against them that claimed they owned the letters ‘LAPD.’
Doesn’t seem like its the same type of situation
https://en.wikipedia.org/wiki/The_South_Butt
Can explain why you think its different? They both seem like they are obvious parodies and should fall under similar rulings/precedents.