During rehearsals the director the actors plot their movements. this is called…

The answer is blocking.

Explanation:

Blocking is a concept in theatre staging, referring to where an actor should position him or herself during a scene in a play. This positioning is determined by the director, with consideration over stage and play elements, such as lighting, audience, and scene content. This term is also used in the film industry, though in this setting, blocking refers to how an actor is positioned in a camera frame instead of a stage.  

it can be both; depending on the situation at hand.

explanation:

let's just say i get in to a confrontation with someone, and they say "ur mom", it could be seen as an insult. or depending on the relationship or comfortability with the person it may be seen as a joke. the distinct line is how the chemistry behind the confrontation.