Competition between food retailers is often assumed to be asymmetrical, whereby one retailer may compete with another retailer but not vice versa. Little is known about how (a)symmetric competition among retailers currently is. One way to investigate this is to use word of mouth data. A mixed methods analysis of customer comments on social media confirms the existence of asymmetric competition among German food retailers, mainly between supermarkets and discounters. Overall, consumers compare competitors frequently on the basis of their assortments, the price-performance ratio as well as quality and freshness. The results have implications for competition policy and strategic management.