[OJFord]

The distinction is that, for example, a 'world foods' (aka 'ethnic'!) aisle in a supermarket categorises stuff efficiently that the local ethnic minority group (predominantly) may be interested in, while more widely consumed (or consumed by local ethnic majority group) foods are distributed elsewhere categorised more according to food type; compared to saying 'you are {local ethnic minority}ian so you are not allowed to purchase {local ethnic majority} foods', which would be discrimination.

Whether it applies to the example above though is I think more debatable.