Yes, they have.

I would also not consider this bickering, as Nuggetross has taken liberties with his accusations of the shop (not giving the complete story of a specific situation/problem), which then requires a shop owner to have to defend himself and his livelihood.

There are constantly customers in the retail and service sectors that take shop/store/business policies to heart, as if the policy was put in place to make them feel slighted, and there seems to be a little bit of this going on in this thread.