It's almost as dumb as renaming lake Ontario to Lake America to "punish" Canada (presumably because it shares its name with the province of Ontario), when that lake has had its name since the 1600's (before the USA or Canada even existed) and is based on a Native American Iroquoian word. And the province of Ontario was named after the lake, not the other way around.
But at least with South Park, I can understand their motivation.
The fact that applying that to produce "South America" which is a real place--and a continent at that--precisely amplifies the absurdity
I have to say, though: inverting the trope of "you can't make people laugh at a joke by explaining why it's funny" by trying to stop people from laughing at a joke by explaining why it isn't funny is a truly Kaufman-esque bit of comedy
"If you have to explain satire to someone, you might as well give up"
-Barry HumphriesHence naming something that is absurd. That is the joke. The renaming is preposterous - that is the message.
Edit: and maaany other "short-circuits" around that idea are suggested.