To keep in mind the Importance of this feature we at Shreeji Infosys developed this Hide Product By Customer/Customer Group extension for Magento 2 which allows you to hide the product based on customer. This extension also allows you to hide the product based on customer group. Once you Installed the hide product by customer/customer group extension you can choose the customer group selection in every product edit section as well as you can also perform the mass action for multiple product at time to save time. And In order to hide the particular product from a customer you can find a product selection list in customer view.