Humans almost always and almost everywhere in almost every context make the short-term choice with immediate consequence with very little concern for the long-term effect which is usually much more diffuse.
Person A going out to buy a Chinese-made microwave from Walmart today isn't going to lead inexorably to decreased property values, but it is going to give Person A something in which to stick their microwavable popcorn tonight. In fact, many Person As have been buying Chinese-made microwaves from Walmart for many years now, and still property values are going up!
Eventually, sure, enough people making those choices on a macro scale leads to factories closing close by, and if there's no corresponding rise in other industries, that will lead to negative economic consequences for the entire area. But that's a far off problem with a lot of uncertainty, and this popcorn isn't going to pop itself tonight!
Of course, it is also true that Person A could go out of their way to shop at a local store and buy a microwave made by an American company, but that the American company decides that there's much more profit to be made by moving production overseas, and the negative economic consequences happen anyway. Not because of the short-sightedness of Person A, but the greed and short-sightedness of CEO B. That's even more reason for Person A to not be too worried about their individual purchase.