It's more that in offline life, I have to deal with lots of people who have crazy theories about climate, and I tend to see HN as a kind of safe space where I shouldn't have to deal with uninformed people offering barely-on-topic opinions. Your justification... kinda qualifies. If you don't understand something here, follow community norms and ask a question.
The next ice age isn't really "due" anytime. Yes, there are orbital parameters which create a long-term varying climate. But you could also argue that it's due right now, as the Yellowstone Caldera is seems to be behind on its eruption cycle.
But none of that has to do with Greenland melting, which is mainly a geological/hydrological process at this point. It's climate-adjacent, for sure, but the questions are mainly how much will melt, how fast, and how much will the land rebound once shedding weight.
And further, this all has even less to do with flooding in coastal areas, as most of the sea level rise will come from simple thermal expansion. (Honestly I'm more worried about Greenland as a albedo change positive feedback effect than the meltwater.) And that's a typical technique of climate deniers -- reframe the debate in terms of something simpler, and then make a sweeping generalization based on that. You set off my filter for that -- sorry that it was a false positive.