If there's a toxic business there's also a toxic customer. What shall you do if you encounter a toxic customer. A toxic customer may have some issues about the products and keep on complaining and asking for replacements and when there's none she or he will harass the business center by shouting and throwing the products. I experienced this in a big store, people were scared and left. The security cannot control only a police officer. This kind is detrimental to the business good customers will be affected so with the sales on that day.