You didn't do anything wrong, but he sure as hell was trying to do something wrong. He was trying to con your ass into buying a Vita. Desperate people say, and do desperate things. He probably thought you were gullible enough that his words alone could get you to go out and buy one. He was actually trying to defend his own investment. He needs you to buy one so that his doesn't become worthless. He just let his frustration get the better of him. On the whole Vita owners are paranoid, and overly aggressive. They are gun shy, because they are backing a failing platform with all their heart.

The truth about the platform is that it is well within the danger zone. A product that has been around for years can survive with sales like these, because there are enough established users to support third party game development. The Vita doesn't have enough users to justify third party development as it stands right now, and if sales don't dramatically improve right now. The portable won't be able to gather enough users up before third party developers begin to cancel their games, and abandon platform development completely.

Once that happens the game is over whether Sony likes it or not. They can't force retailers to carry the product, and they aren't going to convince consumers to pay the asking price if it isn't going to be getting new games, or just two or three a year. They could sell it a heavy discount at that point, but that is like killing your best cows to feed vultures. It would be like throwing good money away, because once a platform dies like this. It cannot be resurrected. The negative word of mouth alone kills off any potential sales. Anyway it is up to you whether you feel comfortable enough with the risk or not, but there is a real big risk with a purchase.

The fact of the matter is that the Vita is actually under performing the Dreamcast in both hardware and software, and we know how that story turned out for Sega. Sony probably can't even salvage the device like they did the PS3. Basically throwing billions of dollars at the problem until it somehow gets fixed. They just don't have the money to do that. Especially prior to the probable launch of a new home console.