Heresy only has a meaning within the Church. Since you are not in the Catholic and Apostolic Church, heresy should mean nothing to you.
A heretic is someone who professes a doctrine other that the doctrine of the Catholic and Apostolic Church. That is actually a "legal" definition of heresy – doctrine outside of, unrecognized as canonical by the Church.
For that matter, calling someone "Calvinist" would be just as "wrong" since, as far as the Catholic and Orthodox Churches go, John Calvin's teaching is outside the teaching of the Church.
Second, because calling me a Nestorian was a clear misrepresentation of my stated belief
If we misunderstood your beliefs, I apologize on behalf of all Catholics and Orthodox. Perhaps what you said misled us to believe you were subscribing to Nestorian beliefs.
I believe the standard translation for the word heresy is "wrong belief". Also, the standard translation for orthodoxy is "right belief". Thus, all you are doing is trying to control the language. The reality from our Scriptural perspective is you are the heretics and we are the orthodox. ;-)