Bad timing can increase and escalate the dispute rather than diminish the tension.
It is important to be clear about what you think the problem is and how you feel about the dispute. Let them know you are listening to what they are saying even if you disagree with what they are saying. This can help you both to feel positive and bring you closer to an agreement. See what you can both do to resolve the dispute. Two people working towards a mutual agreement can get a lot further than one person dictating to the other on how they should change or improve their behaviour.