It's such a snapshot of the most rabid variants of SJW mindsets. The most defensive, insecure, compensatory versions of this rhetoric. Looking at that couple and understanding how human relationships work, you know that they've probably been trying for quite some time; weeks and weeks and months and months of truly dedicated boinking, and now they're so happy that they're finally going to raise their child together, they couldn't help but use that happiness to spread a little humor along with the news. Even if you don't know them well enough to get hyped up that they're expecting, at least you could catch the humor of the joke, and through that be happy for them even if you don't really care.
What kind of joyless, unloved piece of festering human turd would go out of his/her/their/its way to spit venom at that? What manner of motivation does one need to become such an emotionally divorced quasi-human? We're doing the case study right now; it's these people right here.