One reason we moved out of our  neighborhood was because massive numbers of Chinese moved in and i swear to you a literal rotten smell came with them .
Do you think something happened in the apartment?
No, it's just a joke about these asshole Chinese immigrants.
Immigrants can move to another country for many reasons and even when the media tends to focus on them and talk badly about them, they are not all people who do not bathe. You wouldn't like it if you moved to another country and people were automatically thought you smelled bad.