According to chef Gordon Ramsay, there are three signs that a restaurant is bad and you shouldn’t eat there: rude staff, bad lighting, and dirty bathrooms.
Rude staff is an indication that management isn’t running the restaurant properly. Bad lighting is a sign that a restaurant is hiding something. And dirty bathrooms are always a red flag. If they can’t get the bathrooms clean can you imagine what the kitchen is like?! (Pop Sugar)