This essay seems to spend quite a bit of time talking about a term that it never defines. And, assuming there's a definition, does meanness count if it is not m

This essay seems to spend quite a bit of time talking about a term that it never defines. And, assuming there's a definition, does meanness count if it is not made manifest? I think we can probably agree without a more specific definition that a sociopath is mean, but are they only mean if we catch their sociopathy? And if we consider aggression a mean behavior, is aggression universal, or is behavior only aggression in certain contexts?