Apart from the actual meat of the discussion, which is whether the GP's sigh is actually warranted, it's just frustrating to see everyone engage in such shallow expression. The one word comment could charitably be interpreted as thoughtful, in the sense that a lot of readers would take the time to understand their view-point, but I still think it should be discouraged as they could take some time to explain their thoughts more clearly. There shouldn't need to be a discussion on what they intended to convey.
That said, your "you're that experienced here and you didn't understand that" line really cheapens the quality of discourse here, too. It certainly doesn't live up to the HN guidelines (https://news.ycombinator.com/newsguidelines.html). You don't have to demean parent's question to deconstruct and disagree with it.
Sometimes one word is enough to explain something, I had no problems understanding that, and the rest of the comments indicate that too, so it was probably not a "shallow expression" like you claim it to be.
I agree that "you're that experienced here and you didn't understand that" isn't necessarily kind. But that comment is clearly an expression of frustration from someone who is passionate about something, and responding in kind could lead to a more fruitful discussion. "Shallow", "cheapen", are very unkind words to use in this context, and the intent I see in your comment is to hurt someone instead of moving the discussion and community forward.
Let me quote Carl T. Bergstrom, evolutionary biologist and expert on research quality and misinformation:
"Is everyone huffing paint?"
"Crypto guy claims to have built an LLM-based tool to detect errors in research papers; funded using its own cryptocurrency; will let coin holders choose what papers to go after; it's unvetted and a total black box—and Nature reports it as if it's a new protein structure."
Other than "it's unvetted and a total black box", which is certainly a fair criticism, the rest of the quote seems to be an expression of emotion roughly equivalent to "sigh". We know Bergstrom doesn't like it, but the reasons are left as an exercise to the reader. If Bergstrom had posted that same post here, GP's comments about post quality would still largely apply.
That said, your "you're that experienced here and you didn't understand that" line really cheapens the quality of discourse here, too. It certainly doesn't live up to the HN guidelines (https://news.ycombinator.com/newsguidelines.html). You don't have to demean parent's question to deconstruct and disagree with it.