It's a discussion, you're supposed to evaluate the other's arguments and exchange ideas, knowledge and opinions about the subject, not a lecture where you're supposed to trust the other to educate you.
That said I very much appreciate the genuine experts who post here, and hate seeing them driven away by disrespectful people.
HN walks the line between experience and openness better than any other community I know of. It's not perfect but it's still amazing.
Sometimes you don't have any personal experience and then the best thing you can do is post a link to something interesting you read.
If you do have some personal experience, you can tell a story based on it.
Unidan had credibility when it came to biology and ecology. When he commented on matters within his domain of expertise, he got all the upvotes. It was great having someone like that around. When there was a topic/thread/question about biology that one needed a credible answer to, all one had to do was summon Unidan typing his name.
It's a great pity he broke the rules and was banned.
For most of these comments, it just comes down to "why are you right? What's your experience?" There's so many armchair speculators that get upvoted. If I can't go through your post history or look at your cred, why should I trust you to be correct about complicated topics that I might not understand? Do you even write code? Humans judge this stuff based on accomplishments and reputation in real life so why not on the internet?
I only realized this after coming across these kinds of comments about fields I specialize in or have a lot of experience with, and seeing blatantly wrong comments being upvoted and affirmed by other comments. If it's like this for exporting I have experience with, it's probably the same for stuff I don't know. Upvotes and affirmed comments should not be taken as truth.
And in the end opinion doesn't really matter unless you have influence in a community. Otherwise nobody that matters will really listen. Write a longform blog or something more captivating rather than some sneaky comment on HN that people will forget about after a week. Same goes for this comment I guess ;)