First of all, I'm pretty sure that the person who wrote that comment doesn't have a strong command of English.
The comment itself is in response to a meta question on a different StackExchange:
Sometimes, I accept one answer, and it's a good answer, and partly solved my question. So I accepted that answer.
After some time, someone gives one more good answer, maybe better, maybe with much greater details filled in.
Is it good to accept the new answer? Would people be hurt by OP's action?
So, the question is essentially:
Is it good or bad to accept a different answer, after I've already accepted an answer?
(Incidentally, I think the best answer to this question was offered in a comment:
If you want to avoid hurting anyone's feelings, it might a good idea to wait for at least a day before accepting any answer. When you accept an answer, you are signalling to other users that you consider you question fully solved. There are some users who will not even look at questions with an accepted answer. There are also others who will add an extra answer, but only if they think they can offer an interesting different viewpoint. Anyway, accepting any answer, will prevent many new answers from appearing.
but that is not really pertinent to your question.)
Anyhow, another user wrote:
Would people be hurt?
No. Poking a person with a sharp stick usually hurts them. Clicking a checkmark on SE site doesn't.
Essentially, that user is keying off the word hurt, and saying that you can't hurt somebody merely by unaccepting an answer. There's no physical pain involved.
That sets the context for the remark in question:
This answer completely marginalizes the very unhealthy emotional bonds, which I am sure many people on the site have, to their actions here.
I would rephrase this to mean:
This answer trivializes the strong emotions many StackExchange users have toward their contributions on the site – even though such emotions may not be very healthy.
In other words, the user many not be hurt physically, as with a rock or a stick or a punch, but it might still cause an emotional blow.
The respondent also uses the word unhealthy to describe such emotions, which suggests that, while acknowledging some users might have their feelings hurt, those users are probably taking themselves (or their answers) too seriously. In other words:
It shouldn't hurt a user's feelings, but sometimes it will hurt the user's feelings nevertheless.
The upvotes to the comment in question are probably from people who agree with that sentiment.
So, what have we learned?
- To marginalize means to trivialize, or to take something less seriously than maybe you should.
- You probably shouldn't accept this answer of mine for at least 24 hours. Even then, if someone posts a better one, accept that one instead.
- If you do accept my answer, but then someone posts a better one later, you might decide to switch, and that could hurt my feelings – but such hurt feelings on my part may be a sign of an unhealthy emotional attachment, and maybe I ought to take that as a sign that I need to give SE a rest for awhile.
- Most importantly, when asking what something means, always provide enough context so that others can answer your question!