Let's see, they want a surround system, and you try to talk them into a pretend surround system. They repeat that they want a surround system, and you still try to talk them into a pretend sound system. I'd walk away, too.
(Though I would never be trying to buy audio or video equipment at a Wal-Mart anyway, so you need never worry about dealing with me.)
Also, the guy does not seem to be the Bose fanboy you accuse him of being, as he said, IF he wanted a pretend surround system, then he would buy Bose. But he did not want to buy Bose, nor did he want a pretend surround system of any brand. He certainly isn't best described as a Bose fanboy when he specifically said he does not want to buy Bose.