[Note: I will not comment on the general atmosphere on this website—just on criticism and correcting fellow users.]
[Note 2: All mention of "a single user", "one user", "this user", etc. is not about you, @Smithco! I can assure you of that. I think this all rests on a terrible misunderstanding.]
I can understand why you didn't like FX_'s comment on your translation of a French phrase (you mentioned this comment in your comment above). It was not essential to your answer, and criticism is never a pleasant thing to receive. However, I'd have done exactly the same as FX_ did. The fact that something is "unfriendly" does not make it bad: criticism is always a bit unfriendly, but it is often healthy. Do you propose that we should never criticise here? I believe that correcting errors, even small ones, improves the general quality of our website.
I have been criticised many times, and I have tried to correct my answers whenever I felt the criticism was right, or when I felt that it was polite to show a willingness to agree that perhaps I could have phrased my answer in a better way. I have never taken it to mean "you are stupid, and this small error proves that you should not be on this website", but rather "I am a geek and an OCD perfectionist; hey, why else do you think I am on this very website?". I correct other users too, and I do hope and assume that they take my criticism the same way.
There are times when I read an answer that contains a quirky factoid, one that makes me wonder "huh, is that really true?". Sometimes this factoid is challenged by someone in a comment; this usually entails a detailed explanation of why it is wrong, and some voting on the comment, or assent or dissent of other users. Such a discussion is to me an important source of information, much more helpful than mere up and down votes. When I am reading a certain question, it is only natural that I should be interested in those things that others discuss in the context of this answer.
If I see that some experienced users have commented on an answer but they have not "corrected" the quirky factoid, I usually assume that they agree with it, and that I was wrong.
This is why comments are such an important feature of SE: discussion is an indispensable tool in the formation and communication of knowledge. It is a pity that those who founded the SE sites should disagree and even make comments less usable on purpose. Perhaps they will one day be swayed.