If I eat soup with a spoon rather than a fork, does that prove that I have an eating-soup-with-a-spoon gene that was passed down to me by my Pleistocene ancesto

If I eat soup with a spoon rather than a fork, does that prove that I have an eating-soup-with-a-spoon gene that was passed down to me by my Pleistocene ancestors, while carriers of the competing eating-soup-with-a-fork gene died of thirst? Obviously there are some aspects of human behavior that were probably selected for in a Darwinian fashion; it's probably no accident that most humans prefer not to live a celibate life, for example. But that doesn't mean you can trace the link from every behavior back to some genetic root.