Bubonic plague, supereruptions, ice ages, malaria, smallpox, ozone deterioration - lots of these seem small now but that’s only because we’ve already overcome them
That’s the whole point that is being made… we’re talking about humanity - Yeah lots of individuals will die due to climate change, particularly in 3rd world countries but humanity will be just fine overall, just as it was with all those disasters.
Statistically someone was going to survive, you're lucky it was your ancestors, but it doesn't mean you will be lucky again.