In this context, that does not read like a genuine welcome but rather as a sinister insinuation. That is seriously against the site guidelines. Please read and stick to them: https://news.ycombinator.com/newsguidelines.html. We want HN to be a place that's open to newcomers, not a smug and insular backwater. Internet users (including HN users, unfortunately) are vastly too likely to assume sinister manipulation and bad faith in others.
By leading with a swipe like that, you not only break the site guidelines, you discredit the rest of your own comment. That's a pity. Please stick to substantive points in the future, and follow the rule of assuming good faith even when you feel like the other person isn't necessarily in good faith. The primary reason for the rule is that you (i.e. all of us) owe it to the community, not just to the other person per se.