Can we please retire this "sweet summer child" thing? It is annoying af, rude, and likely never written by anyone over 30.
Well, George RR Martin would be super happy to know he's under 30 :-)
For what it's worth, I'm not under 30 either.
It's light-hearted and slightly irreverent. Whimsical, one might say.
As someone in my 30s, I've always thought of it as an "old-timey/old person phrase", same as sibling comment's "bless your heart".
ZIRP has created an entire generation with absolutely no clue about the very existence of, let alone the harshness of, cycles.
https://news.ycombinator.com/newsguidelines.html
Attacking the phrasing is not what we're looking for here at HN. The meaning of their comment is clear.