Sometimes the criticism is off-base, but you can usually count on someome pointing that out just below it.
I can see why it might rub you the wrong way, but I just want to point out that it's not objectively bad for everyone. For me, it's the point of coming here.
At the same time I will occasionally run across a post thats pretty much self explanatory but nevertheless the top post will still be someone trying to massage some angle to get a one up, which I find irritating. For some things I think its just best to appreciate it for what it is and not try to find the inner flaw. I find myself falling into this line of thinking (finding the flaws in everything) and I find i'm happier when I'm not constantly like that.
... oh wait...
... you may have a point...
"Please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize."
I do think many first comment are snark or one uppers but sometimes it's the quick path to a bullshit detecting outcome. Any cryptos deserve a big cluestick whack, many machine learning and AI more so!
I think people just like to share their experiences because there's rarely a "one size fits all" answer to most problems. One of the ways in which we grow and develop our ideas is by discussing them with our peers. It also seems likely that people who disagree with a post are more likely to comment and write a rebuttal.