When he competed on the 14th season of he became fan favourite due to viewers believing he owned a grocery store - and that was immediately when he was dubbed Grocery Store Joe.
Joe also gave many hints that he presumably owned a store on his social media.
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story in which he guided his followers through the organic selection available in a store - including peaches and mangos.
His Instagram also has a story highlight where it shows him visiting all different grocery stores in the area that he worked in the past, which could've also imply he had/has his own.