You missed the part where he rails against Best Buy for inventory logistics without realizing that Apple controls who gets what phones and doesn't tell them in advance, and rails against Best Buy for selling phones without filling all preorders without realizing that they have 18 SKUs and surplus of some and not enough of others.
The guy shouldn't have been treated rudely, or been given a fake $100 bill to refund gift cards he purchased on debit, but not everything in the novella was Best Buy's fault.