Many foreign teachers have flirted, charming, even rape, forcing Chinese girls to have sex with them. Those who have failed, lazy and could not have a good job in the West, quickly became a teacher in China just because they knew foreign languages. And most recently, a black teacher killed a Chinese student because she didn't accept his flirt.
On YouTube, there are several extreme Chinese anti-channels. Founded by foreign teachers. People who come to Chinese teach English, then flirt and marry a Chinese girl, and now he earns more income with Youtube channel - insulting - China
It is in the field of education, not taking into account foreigners in other service and industrial industries