I think that the poster in question was assuming that you were unfamiliar with the Singularity in general, rather than enquiring as to the nature of the Singularity that occurred in-comic in particular.
Or, possibly, that you were silly enough to confuse the QC world with our own; they've had Strong AI since the start of the comic, after all, a superhero who delivers pizzas, and one one the cast grew up on a space station. Needless to say, it only appears similar to ours since we're just seeing the lives of a small circle of hipsters who run a coffee shop and an office-bitch-turned-librarian. I'd imagine that, say, their US Military probably looks quite different to ours.
they've had Strong AI since the start of the comic
Incidentally, I only just noticed that the latest comic's title is They've Had AI Since 1996. IIRC there was a calendar shown at one point implying(?) that it was 2004, but that's probably contradicted elsewhere, even accounting for transplanted pop culture.
Elsewhere in the comic: How did sentient machine intelligence come about?.
As a part of public relations, I think it's important to keep tabs on how the Singularity and related topics (GAI, FAI, life-extension, etc.) are presented in the culture at large. I've posted links to such things in the past, but I think there should be a central clearinghouse, and a discussion-level post seems like the right place.
So: in the comments, post examples of references to Singularity-related topics that you've found, ideally with a link and a few sentences' description of what the connection is and how it's presented (whether seriously or as an object of ridicule, for instance).
There should probably be a similar post for rationality references, but let's see how this one goes first.