This is in the site guidelines: https://news.ycombinator.com/newsguidelines.html.
(As a side note, one reliable indicator of thread deterioration is when people start arguing about what each did or didn't say.)
Instead of putting down the other person's knowledge level, it would have been better to share* some of the specific goings-on of early cipherpunk mailing lists, since you obviously know something about that. That would have gratified the curiosity of the general readers (me included!) and this is more important—it is in fact the purpose of the site—than defeating somebody in an argument.
As for the other user getting flagged, I appreciate your looking out for them—but it isn't about either you or them, it's about the general audience, which comes here hoping to read things that are more interesting than putdowns and tit-for-tats. We have rules (https://news.ycombinator.com/newsguidelines.html) that try to encourage that and discourage the opposite, and when people break those rules, it's good to mark that by flagging the comments because it indicates to the rest of the userbase that concern for discussion quality remains present here.
* https://hn.algolia.com/?dateRange=all&page=0&prefix=true&sor...
It is ironic that a discussion about solving political/social problems with technological solutions, on a news aggregator like this one, has taken this turn: self censorship and moderation in the furtherance of discourse quality control.
Low-information internet putdowns land with readers as swipes, especially with the reader who is the target of the putdown. This degrades discussion, so we don't allow it here.
This is not a problem that some upstart technology can handle, it requires a societal act, and society acts through its government. Maybe you are satisfied with defeatism but I am not.
we have technical solutions. they are either not working, or are not being used. (or are misused so much that they get a bad reputation)
an upstart technology will not change anything if noone cares.
the only way to create lasting change is to make people care.
one person at a time.
If you wouldn't mind reviewing https://news.ycombinator.com/newsguidelines.html and taking the intended spirit of the site more to heart, we'd be grateful.
I scolded the other user as well, but someone else breaking the rules doesn't make it ok for you to.