Disengagement.
If I can physically disengage, walking away from the situation, I'd do it. If not, I'll mentally disengage. Enough times of this, I'll just default to it: not giving a shit because apparently, no one does.
If I must engage in it anyways, maybe I'll return to it once I've calmed down. If I must do it there and then (so, no time to compose myself), I'd do minimum I can get away with.