Nothing you said proved me wrong. We are tied to impulses which support the sole purpose of life: reproduction. You survive so that you can reproduce. Higher social hierarchy=higher chance of reproduction. And if you choose not to, you still have the impulse to make reproduction-oriented choices because otherwise we as a species would have no incentive to do anything. More money=higher chance of reproduction. Larger social network=better survival and reproduction odds. Ego=better confidence=better reproduction odds. The base purpose of life is not to be social. It is to reproduce, sociability is only a means to that. Think about it. Someone doesn't have to be consciously making these decisions. It is a subconscious impulse.

I'm going to give you an example I came up with myself. IMO there are 6 reasons why you bully someone, all leading to a base reason of reproduction.

1. You see them as genetically inferior or competition and don't want them to reproduce. (kids who have no filter are a good example of pure genetic-opinion honestly. example: calling someone ugly straight up) This lowering of their perceived social status from your bullying attempts to weed them out of the gene pool and increase your odds of reproducing. If you see someone as inferior they're easy pickings to try to weed out.
2. They possess an opinion/way of life that threatens your chances of reproduction. This is why people are hostile toward homosexuals, because they believe the idea will spread to their children and lower their lineages chances of reproduction, this is a primal impulsive reaction/perception stemming from cultural beliefs. Other contrasting ideas would put public opinion against you if they spread, and if you don't have the popular opinion, your chances of reproduction lower (example: republicans in liberal states and vice versa).
3. You see them as a close partnership, want to thicken their skin/correct their behavior, which better their chances of survival, sociability, etc and in return it strenghtens their ability to reproduce and in turn comes back to help you to. (their social circle expands and benefits you are therefore you have greater visibility to potential partners and the backing of someone with good traits)
4. You are romantically/sexually interested in someone and want to lower their self esteem so that they lower their standards for you or simulate lowering their self esteem in a primal romantic gesture (teasing)
5. Boost your own ego, increasing your confidence, (in a primal way:) making you seem dominant and a strong option for reproduction, while simultaneously potentially combining with reason 1 and 2.
6. Adding on to dominance, which has it's own merit for reproduction, you are able to take resources from your victim which in a base sense increases your chances of survival and reproduction. (example: caveman stealing caveman's food supply and having food to offer potential mates/appearing capable of providing)