There's only 5 countries in Polandball that use proper English. The rest use whatever crap the author can think of. It's kind of well known that when Japanese and Korean learn English their accents are very strong and they have trouble pronouncing letters cos it's not in their languages. After speaking it for a while they get better.
Polandball is about the stereotypes. You're making a big deal out of it when it shouldn't be. Contrary to popular belief (actually contrary to SJW belief) stereotypes does not mean racism. They are two completely different things. There are racist stereotypes, but aren't really common if you know the dictionary definition of racism. This cartoon was not racist.