"Don't be snarky."
"When disagreeing, please reply to the argument instead of calling names. 'That is idiotic; 1 + 1 is 2, not 3' can be shortened to '1 + 1 is 2, not 3.'"
"Please don't post shallow dismissals, especially of other people's work. A good critical comment teaches us something."
"Please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize. Assume good faith."
https://news.ycombinator.com/newsguidelines.html
Thoughtful critique is welcome, of course, and you've got the kernel of that here. But it's important to avoid the putdown aspects and to remember how easy it is to misread others and misassess intentions. That leads to gaps in our perceptions, and we tend to fill in the blanks with crap that's actually drawn from our own imaginations (and sometimes is looking for an excuse to vent itself), which typically makes for less interesting discussion.