I mean, if I woke up and read that 500 million mosquitoes were victim to the Australian wildfires, I might not be so sad either.
But then you watch a video showing the charred carcasses of many beautiful Australian marsupial and bird species littered on the side of the road [1], and you realize jokes aren't really very useful here.
I think they are just pointing out that the people who think they love animals actually only really seem to love cute animals. And when you think about that for a bit, it seems less pure.