An extremely shocking video showing a teenager kicking an elderly woman to the ground, apparently because she warned him to be careful with his bike, has ignited outrage across Chinese social media.

In the video, the 18-year-old guy is seen holding his bicycle and angrily slamming its tires against the ground. A passing 87-year-old grandmother notices his frustration and reportedly warns him that “you’ll break your bicycle that way.”

The teen responds by throwing an object at the old woman before running at her and kicking her in the stomach. The granny is sent sprawling to the ground where the young man stomps on her and even hits her with her own cane until a confused passerby arrives and takes the cane from him.

The old woman was taken to the hospital, having suffered multiple fractures in the beating. Meanwhile, police in Zhejiang’s Haining city have arrested the young man. It’s not yet been explained why friendly advice from an old woman ended up causing him to explode in anger.