A teacher from the Chinese mainland was berated recently after letting one of his students take a dump on the floor of a Hong Kong subway station.

The teacher was escorting a group of five primary school boys (who look to be about eight or nine years old) through the Tsim Sha Tsui MTR Station when nature suddenly called. In video from the scene, the students and teacher are seen standing awkwardly around a corner of the wall where a mound of tissue paper has been piled up while being scolded in Cantonese by a subway cleaner who is now forced to deal with the mess they have made.

Neither the students nor the teacher respond to this criticism, so the woman filming the video starts calling them out in Mandarin. “We are in Hong Kong, this is not your mainland!” the woman tells the teacher.

Finally, the teacher decides to speak up in his own defense, explaining to the woman that the kid had a sudden stomach ache, implying that he had no other choice.

“You can find someone else to help with a stomach ache,” the woman angrily replied. “What were you thinking letting him defecate here? Children can’t help it, but you’re an adult taking them to Hong Kong and you can’t deal with such a small matter!”

“Do you see who is helping to clean up your mess?” she continued. “You let a child defecate and then you don’t clean it up. You want us Hongkongers to clean it up for you!”

On Weibo, Chinese netizens have similarly shamed the teacher, calling him yet another person of “low quality” who has embarrassed his compatriots while visiting Hong Kong. In this same subway station two years ago, a woman squatted down and took a shit right on the floor, apparently unconcerned about being seen by passersby.

“It was completely disgusting,” recounted one witness. “She just put the paper down and started shitting, for her it seemed totally natural.”