See, that's the thing about social media for customer engagement. You should be addressing concerns head on and not changing the subject. The followers of the patron, and the followers of the business, are watching the conversation to see what happens.
Elevation should have stepped in with what I said in my second tweet above. You have to make people aware of the unique value proposition of your product if there's ever a criticism of it (i.e. "our ingredients are better!").
Otherwise, when they're deciding where to eat a burger, they're going to choose the place where they can spend $7 instead of $12.