Let's imagine a situation: you started a conversation with someone, at first the conversation goes normally.
And then someone said something that started the argument.
Your interlocutor chose an emotional way to defend his point of view and began to raise his voice at you.

What to do in such a situation? Start shouting back? No way!
If your counterpart starts speaking in a raised voice, don’t follow his example.
The interlocutor raises his voice: what to do
The answer is simple: don't mirror this person's behavior.
Continue speaking calmly. Perhaps it makes sense to answer even more quietly.
Don't be afraid of not being "heard." And don't think that you'll lose an argument because you speak softly.
Another situation will arise - a more interesting one.
You will force the interlocutor who is speaking in a raised voice to start listening to you.
Most likely, the other person will stop talking loudly. Emotions will subside. A quarrel will be avoided.
If your interlocutor doesn't want to speak more quietly and adapt to you, he will start to look stupid.
The situation will be as follows: you speak quietly and calmly, and your interlocutor speaks loudly. The other person demonstrates that he/she cannot control himself/herself. This means that you have won the argument.