It's just satire but there is some realism because the game takes a good amount of inspiration from Los Angeles which is full of gangs such as the Bloods and Crips which primarily have African Americans as their members while the Vice Lords are full of Hispanic immigrants. A good majority of them being Mexicans.
I'd go on an African Safari too if it wasn't for the fact that places like South Africa and Zambia are in the middle of civil wars moreso South Africa and those are the two countries where you'll run into African wildlife like elephants, giraffes and others.