Gratefulness doesn't come naturally to these people. Usually, people are taught from the time they're young that when someone gives you a gift , you should be thankful. Even if you don't like the gift, you should thank the person who got it for you. When they're five or under, kids tend to be brutally honest about the gifts they do or don't like, and it can be pretty funny for those around them. But when a teenager throws a fit because her parents bought her the wrong car? That's a whole lot le…