if a person is unable to discern the purpose of the walmart sold Shimano parts to that brand's parts being sold at a reputable (new bicycles) bicycle shop, then I'd not expect that person perceived reputation to change unless they were willing to accept being educated on it.
I'm sure Shimano has mulled over having walmart being a retailer of such bicycle parts... if the parts are not legit & are illegally using the brand's name, that's a totally different ball of chain wax to contend with.
__________________
-Oh Hey!