We are categorically not parasites. We don’t live in/on another organism deriving nutritional value from the bodies as hosts

We and other animals eat plants/plan eaters directly. We are not hosted by plants or plant eaters.

If that were the case, other animals would also be parasites. At most, we are predators

There are many definitions of parasites tho and all hinge on the time the parasite spends in/on the host