Walmart, a chain superstore that sells pretty much everything. Pharmaceuticals, clothes, groceries, outdoor material, furniture, and even firearms. It has pretty much everything you can ask for, and at much lower prices than mom and pop stores too. In addition, they accept EBT for payment. As with anything that is affordable to the majority of the population, it will attract the lower class individuals.
Catering to such individuals will also attract them in great numbers. When you have these individuals congregate en masse, there is bound to some drama that erupts eventually. For this reason there has been many memes regarding the customers of Walmart.