That’s Dr. William Schaffner, professor of Preventive Medicine and Medicine at the Vanderbilt University Medical Center. He has over 59 years of experience in the medical field. Why do you ridicule him?
A quick perusal of the good doctor’s video commentary history shows him always being on MSNBC or CNN and never on Fox, always wearing his name-embroidered white coat (in case we forget to succumb to authority bias), being hostile to Trump for not wearing a mask, a mouthpiece of the CDC during the pandemic, and unhappy when the CDC removed the mask guidance. With all that, and his 56 years of experience, when this sombich uses highly-charged, inflammatory language like “Unvaccinated people are potential variant factories,” ridiculing him is being generous.