It was snarky and reduced another commenter's position to something stupid, in order to dismiss it. Those are both hallmarks of flamewar and the site guidelines specifically ask you not to do either of them:
"Don't be snarky."
"Please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize. Assume good faith."
Btw, if you find yourself "calling people out", you've definitely departed from the space we want discussion to happen within on HN—what you could call the window of curiosity. We're trying to avoid the online callout/shaming culture: https://hn.algolia.com/?sort=byDate&type=comment&dateRange=a...
Calling people out for victim blaming is flaming?