So the gist of it is that you are looking for a solid definition of "Calling Out". The primary aspect is that the criticism is addressed to the public as opposed to the individual that the complaint is lodged against. Per the current "Calling Out" rules.
"It is inappropriate to publicly create a thread that calls out the behavior of another member (including staff members). If a member's behavior needs to be addressed, use the "report button" for the post, or use the private message system. An attempt to "rally" the community against another member or members, will result in an infraction and immediate deletion of the thread."
And in Evan's post he was talking about me to the community, not talking to me. And in your example, the complaint was made to the person who wouldn't continue the debate so it would not qualify as Calling Out.
So I would define "Calling Out" as "criticizing someone's behavior to the public at large" and I think it is a form of harassment.
So in short, I do think that Calling Out is a specific action that ODN should not allow and it should be reflected in our rules. As I believe it is a subset of harassment, I would just add it there.