Engagements are adversarial. Each has its code of ethics. The Canons and the Queensberry Rules. Both codes are generally observed. The common goal is to destroy the opposition.
Civility is never out of place.
It is always appropriate. In the squared circle we sometimes see the grandest display of civility. Near the end of a long, evenly matched contest, one contestant begins to emerge as victor. Don't let me hit him again. I don't want to hit him again.