Learn to mentally meditate
Many psychologists advise to switch off at the moment of anger. Learn to escape from reality, as Dr. Cox did in the series Clinic. If he did not like the conversation, the sound of the tide and the singing of seagulls immediately turned on in the head of this cynic. Such a technique will not only save you from unnecessary curses against your boss, acquaintance or conductor, but will also save your nerves. Moreover, the absence of any reaction on your part will help to reduce the conflict to "no". After all, a dispute is possible only when at least two people participate in it.

Recognize the signs
Learn to catch the moment when hidden discontent begins to slowly turn into anger. Usually this process is accompanied by a rapid heartbeat, a lump in the throat, a shaking voice, weak knees and tremors in the hands. Once you spot these enemies of peace, consider that half the battle is already done. Then proceed according to circumstances.
If you have enough willpower, then try to pull yourself together, mentally count to 10 (as is customary) and watch every word you say. If the anger is so strong that there can be no talk of control, then there is only one option - to avoid continuing the conversation at all costs. You can abruptly stop communication, for example, under the pretext of an emergency call or some other nonsense, or you can simply run away, as if from a crime scene. The only thing to remember is that it all looks very strange, and later you will still have to explain your behavior. On the other hand, during this time you will already calm down, come up with an excuse and definitely not say anything superfluous.

Remember to choose
Do not forget that there is always an alternative to a quarrel. Any uncomfortable situation has a hundred exits and entrances, which do not necessarily lead to conflict. Let's say, if it infuriates that someone is listening to music in the subway car too loudly, then instead of an evil hiss in the direction of the disturber of the peace, you can use the headphones and turn on the songs that you like, or, in the end, transfer to the next wagon at the next stop.
Here you ask: “Why should I go out, and not he / she? I'm not disturbing the public order!" Firstly, this conditional music is annoying, most likely only you, the rest of the majority in the car will not care. Secondly, there is nothing to waste your nerves on trifles. Apparently, you forgot the words of your biology teacher, who, back in the seventh grade, said that nerve cells have a peculiarity of not recovering, and excessive nervous activity contributes to the development of diseases such as neurosis, chronic fatigue and insomnia.