I sincerely do not believe that this behavior is genetic. As you've said, many of us live in competitive capitalist societies, we are conditioned into a socipathic mindset by advertising, and educated to reduce the people in our lives to numbers on a spreadsheet. This is not how humans are meant to function, we have been conditioned and trained to think this way.
It is exacerbated by our current system for sure but I think the core of it is still there, genetically. I say that because I remember my old dog would act up if I petted the cat sometimes. Also very young toddlers show envious behaviour when a sibling is born.
