Don't quit, file a formal complaint with the restaurants General Manager, take these steps to protect yourself first:
1. Attain the footage of the act
2. Request written statements from the witnesses
3. Document everything you do in regards to this situation.
Your company has a legal obligation to provide a safe workplace (s.44(2) of the BC Human rights code the employer can be held vicariously liable for discriminatory acts), what the executive chef is doing to you is Harassment if your company has a harassment policy make sure you read it and cite it in your formal complaint.
if an internal investigation does not solve the issue, file a complaint with the BC Human Rights Board
File a Complaint - BC Human Rights Tribunal