Impressing People

"We spend money we don't have on things we don't need to impress people we don't like." Why is this?
First of all, we can't even afford whatever it is that we're buying. It makes no sense to spend money you don't have because it leads to debt and history has proved time and again that going into debt is generally a bad idea.
The only reason to spend money you don't have is if it's actually something you need, like food, or shelter, or medicine. Maslowe's hierarchy of needs shows that these basic needs are the most important, and in fact we can't focus on any other needs until these immediate basic ones are met. If someone is able to focus on things they don't need, that must mean they have enough money to buy all the things they do need, they just don't have the money for a lot of extra things.
However, in some cases, trying to impress people you don't like does make sense. The people that you like have probably reciprocated that like towards you as well, which means that they're already impressed by you and you have no need to try around them. Though this may be the case, it is still unnecessary in most circumstances to spend money you don't have on things you don't like for the sole purpose of impressing others. If you get something, it should be because you need it; or you want it and like it and your needs have been met.