When people express opinions online they want feedback on some level. Since not everyone is Socrates, most of the times the arguments aren't that bulletproof. Hence the noise. However, desperately need to prove others are wrong is usually lack of self-love.
Discussion
I agree with you on most of this except for how I’m interpreting the way you used to word, “feedback”.
Kind of depends by what you mean by feedback. If you’re using the definition as just pertaining to: reactions, boosts, zaps, and comments in this context, I disagree. If you mean feedback to include a more passive meaning as well (e.g., to share just because you think someone may like it or learn from it), I totally agree. In general, I think people tend to share things publicly because they want people to see it or enjoy it, although there are some who have the intention of getting more obvious attention like comments and zaps.
I’m glad that you mentioned Socrates because he once said, “I am the wisest man alive, for I know one thing, and that is that I know nothing.”
Feedback as response that would lead to learning something new. Literally everyone I've met so far, regardless of IQ, wealth or social status, is stuck on a deep question or series of questions. You're likely a piece of the puzzle if not the entire puzzle for them to solve their dilemma or the other way around. That's why I encourage useful arguments. It's likely that more cam benefit from it.