Agreed, and this is something that is learned through the study of psychology. I feel it is best if we try to avoid allowing negative experiences from the interaction with one person to spill over into the interactions with other people.
We must always remember that we don't know what everyone we meet has been through. Something I see as a small issue could likely be "the last straw" for someone else who has had a string of bad experiences and becomes irate when I happen to interact with them. From my point of view, they're blowing a small issue out of proportion, but their point of view would be much different. This, I feel, is where compassion plays an important part.
Dude, you don't have to be that rational and analytical about it

What if the other person actually CAN'T think rationally? You really never know what is standing in front of you, even if it seems normal.
From bad experiences early in childhood, I learned to just don't jump into aggression or to yell at people because I see them doing something "irrational", even if it seems at first that they are trying to insult me. Because you really never know.
You may think that I just refer to encounters in traffic or the supermarket, but at one job I had, in a top University in the US no less, I was working in research. One day, I had to deal with a lady regarding HR matters. She would always, ALWAYS yell at me. She would berate me. She would make snide remarks or back handed comments. Every single time. Didn't matter the time of day, whether I did everything correctly (or gasp! incorrectly!) or in advance. God help you if you actually didn't know something and needed to ask her. She would treat me (or anyone) like an idiot. But I never jumped into the insult exchange. I know many persons that, at least culturally, would see very wrong for a man to be berated by a woman and the appropriate response would be to at the very least raise their voice. I know some people that would see a trade of insults justified in these cases. Still I didn't speak back. But by the 5th time it really stroke me as very odd.
So I asked around and eventually I learned that this lady was bipolar. Severely so. And had pushed people around for decades, gradually it seems. But the University felt that it would be compassionate to actually provide her with the job (since she actually did do) and that it provided her for an environment for her to feel useful and sustain herself, etc. And of course this also helped her loved ones since she didn't have to be taken care of.
So, after learning all of this, I was glad that I didn't insult her, and felt a little bad for her at first. And then I thought, well, isn't all of this a nice gesture from everyone involved? I can assure you she didn't have any malice. After thinking carefully about it, no one involved was choosing bad options. It is just life is, for the lack of better terms, very challenging.
So, after all of this, I still don't get into arguments, especially with strangers. Be it a traffic incident, neighbours, or any place. Especially on forums on the internet!


Because you truly never know what is going on...