Now I would like to overview the occurrence in this individual case.
I quoted a person's some linguistic activity that I happened to see in my timeline, and I wrote the cultural background of the usage.
My post could certainly have had an effect similar to the so-called reply guy or sharkey (just as someone kindly commented), or there is room for it to be perceived that way, aside from the issue of the difference between quote or reply.
Of course I could have avoided notifying the person by simply stating the URL of the quoted post instead of the formal quoting feature.
...And the person felt probably hurt by that.

@mikoto that user thought you were wrong regarding something about zodiacs and “our culture” from what I saw of that thread not so much the quote feature itself. *shrugs* basically accusing you of being a nihonjinron-bro lol

@mikoto after interacting with that individual directly, I don't believe they were hurt by it. I believe they feel themselves to be an authority on all things Asia and are intolerant of even the smallest errors or appearance of anyone else having their own thoughts that they haven't approved of.

That individual has a very obvious "main character" syndrome problem. And a horrible, combative attitude.

In this case I think the simple answer is just to block the offender and move on.

Based on their responses to both of us they've already been suspended from this server. Their desire to start fights isn't welcome in our community

@sayonaraminasan Oh, I am grateful for your kind suggestion.
Actually I will not communicate with them anymore and I think the disagreement on the specific issue of zodiac can no longer be resolved. So I would like to concentrate on the general issues on how Quote works, which may be more beneficial to everyone.

tbh it is difficult for me to tell that the quoted person behaved entirely reasonably, either. But I can understand that the sudden, lengthy mention (whether a quote or a reply) might have provoked them, and I could have anticipated this to occur to some extent.
Of course, everyone may get nervous temporarily or permanently, and we should be considerate of each other's delicacy and their own sense of dignity, and be tolerant of other's gaffes. (I hope you all will be tolerant of me too!)

I still don't have any ill will toward the other person, though it was a difficult conversation and I suppose that I'd better not communicate directly with them anymore.

@neatchee I appreciate your considerate suggestion and I am so sorry for taking up your time again.
I blocked them just after they started posting something offensive to me. I am not sure whether their sense of pride is hurt, and whether their self-evaluation is appropriate socially and culturally, though.
Now I would like to work on the problem of the significance and effects of quotation, which hopefully be helpful for everyone as one of the failure cases. (sigh)

I have received a variety of comments from many people regarding this case.
Some of them are fair and convincing criticisms of my actions, while others have thankfully offered positive feedback about my behavior.
In any case, social media isn't just about one-on-one conversations; it's basically many-to-many communication through each person's own timeline. In other words, a public society exists here.
I realized that I have been greatly helped by the FAIRNESS of the people in this online community, and I am grateful that this is a place where we can trust each other's fairness.

3?) Here, I would like to talk about my own temperament and style.
My English may probably seem quite stiff. That is not because I am cold and aloof, but simply because I know very little frank English. For example, I can hardly use modern slang.
I have to keep on the (to-be-)formal and awkward English in order not to accidentally use impolite expressions though I am trying to be as kind and friendly as possible in my communication here.

I have to consult dictionaries for almost every post regarding synonyms, prepositions, countability of nouns, etc. and I often examine the text by automatic translation before posting so that the post doesn't unintentionally have some inappropriate meaning or become absurd. English learner!

I am also an old-fashioned Japanese-style nerd.
The basis of my interests and communication tools are useful information about hobby and culture rather than personal, everyday emotions. I live on information, living by and through the content of my hobbies. My identity is based not on "who I am," but on "what hobbies I choose, what knowledge I possess, and what aesthetic judgments I make."

However, this characteristic can possibly appear to be, or act as, an unilateral, impersonal, and ostentatious talk, which may annoy others. This can especially apply when talking about Japanese culture.

Fortunately I am in a server where many people love various kinds of contents that are basically connected to the country and culture I belong to. Therefore I may thoughtlessly have a higher-than-average expectation that talking about my own culture will be well-received.
I am trying not to take it for granted and not to fall into the trap of xxxxxplaining, but if the readers feel I am being pushy or authoritative, please feel free to criticize or remove me.
I hope I can continue to talk about anything interesting for me endlessly and to share them with the friends here! Thank you!

@mikoto@urusai.social I’ll repeat again that the incident in question involved someone who assumed bad faith on your part and thus overreacted (imo). It’s not bad to reflect and muse on quotations, but don’t knock your head too hard on it.

On another note; I don’t have a lot of patience for the people on fedi who have little understanding about public audiences and differing communication styles, and treat everyone who writes a comment that isn’t full throated agreement or something they wanted to read as a personal offense. They lack emotional maturity.

Null This is a space with a large oversampling of people who have suffered abuse on centralized platforms both want to be able to speak publicly but also have total control over who can hear them.

The lack of emotional maturity is systemic.