When engaging in public feedback sessions after a reading of my plays or scenes, I follow a nearly invariant rule: never respond to a note other than to say “thank you” or to write it down (and yes, I really do write it down, not my shopping list). I’ve only broken it when I’ve felt someone has said something insulting (see my post on Warning! Lecture Ahead), and even then I would do well rise above it and follow my usual rule.
But when I’m discussing it with somebody one-on-one, I will sometimes break the rule and tell them why I’m not doing x. I suspect that is still a mistake. Because sometimes comments need to percolate.