The e-commerce giant bans shoppers from the site for infractions such as returning too many items, sometimes without telling them what they did wrong. Amazon has cultivated an image as a customer-friendly company in part by making it easy for shoppers to send back items they don’t want. The site’s lax return policies have conditioned consumers to expect the same treatment from other retailers, adding to pressure on brick-and-mortar chains. But shoppers are finding out there are some customers Amazon has determined aren’t worth keeping………….