One od my loved ones (LO) likes knives. This LO practices hand drills, with the knives, to develop dexterity.  The dexterity is appreciated.  However, I've requested, more than once, that these drills not be done in the kitchen or dining room using the kitchen knives or table knives whilst we are talking. I want this LO to be aware that the practice of knife handling, while conversing, could be construed as menacing if done in front of someone not in the immediate family.  Today's reminder did not sit well with LO.  Voices were raised somewhat.  The conversation ended with "My kitchen, my rules."  AITA? 