I would really, really like to hear one of these goofballs explain this. Most of the warming that has occurred has been in the polar regions in the winter! The rest of the planet has seen, on average, little warming. So they are saying that a warmer winter in the arctic will cause more viruses? LOL
Over the past few thousand years people died from plague more in the centuries long cooling periods (i.e. Greek Dark Age, Dark Age, and especially the most recent Little Ice Age). The warming periods (i.e. Minoan Warm Period, Roman Warm Period, Medieval Warm Period, and Modern Warm Period) are great times to be alive, including relatively small loss of life from disease.
For example, as bad as covid is (pretending for now the numbers are real) it's nothing like when 1/4th to 1/3rd of Europe, Asia and Africa died from the Bubonic Plague.
If you're worried about plagues, warmer is better. We should be glad we live during the Modern Warm Period. If there's any regrets about it, we should regret that the Modern Warm Period isn't liable to get as warm as the most recent warm period, which didn't get as warm as the one before that, etc.