Holy moly, chill. There was no criticism, nitpicking, or “telling others what to do”. What an absurd extrapolation. It was a polite and harmless observation—one that I would have appreciated getting myself, by the way—on a funny comment that requires prior knowledge to understand the joke.
And yeah, you are overanalysing. Despite having read and enjoyed Mitnick’s Ghost in the Wires¹ I had absolutely forgotten 2600 was the specific frequency and had to hop around a few links to recall what this was about. Who would self-congratulate on something so small?
Hacker News is ostensibly about curiosity, so explaining references is absolutely on topic. And being lazy is a hacker trait, I personally dislike when I don’t pursue something interesting because there was no easy link to follow.
The irony in your comment is something else. Don’t assume bad faith.
https://en.wikipedia.org/wiki/Phreaking#2600_hertz