thanks darcturian, yes grandma would probably be respectful of your honesty and change her behavior making things better if interaction 2 was utilized AND if you played the cards right you could probably find another cookie you prefer to be made or something else. interaction 1 may "feel better" letting those kinds emotions out, but long term would be far more detrimental to the situation and relationship, in turn creating greater conflict and INCREASING stress etc.
As i said there are those that see Radical Honesty as a means of being a jerk to people and hide behind the label of using a "scientific method" and practice to better interact with people. Unfortunately what we find is that the human condition makes us look at many things with considerable bias, we take the bits we like from the concept, like telling people off and how you feel, and we leave the bits we dont wanna deal with, using the truth to build a better relationship or any of the other principals that "are hard". The Human Condition corrupting perfectly good systems and theories since... always, lolz.