People forget what the fight was about. They remember the worst thing you said in it.

Arguments have a short memory for content and a very long one for damage. In six months neither of you will reliably recall the dishes or the plans, but the one line that was aimed to land stays, because it told them what you think of them when you are not being careful. Winning and wounding are not separate outcomes you get to choose between afterwards.

Let the sharp sentence lose. Say the dull version instead, or stop talking for a minute. Very little of what you leave unsaid in a fight turns out to be a loss.