Wonton fonts were invented in America, like fortune cookies. The font is a caricature of Chinese writing systems. And it's confusing for anyone that isn't American and isn't already accustomed to the stereotypes of Chinese culture in America.
When Chinese people use pinyin or write in English, they don't write like this.
I also don't think it's intended by the artist in a negative way. I'm only pointing out that there's no need for a font that's used often in a negative way. If wonton fonts were needed for the joke, then I'd let it slide. However, since it actually doesn't matter how the word China is written, it just stands out as weird.
In real life, they would be arresting the teacher too. Depending on the state.