From time to time, we will run into situations where someone will get aggravated and start speaking loudly or aggressively. And, when peaceful calmness is broken, no one wins. Aggravation and loss of one’s temper never put anyone in a good light.
Speak softly, for loudness and agitation only bring more volume and anxiety in return. If you talk softly and look at the other person while doing so, and the louder they get, the softer you speak, they will calm down, and the tension will begin to evaporate. No one is helped by anger. And, no one is understanding anything, while voices are enraged. Anger only causes more anxiety and rage.
At that point, everyone is trying to outdo everyone else to win.
If you want to win, be quiet and in control. Doing so you can disarm rising tensions.