You should ask them if they got flu/whatever shots every year.
What I find noteworthy is the disparity in the anecdotes regarding COVID. There are a lot of posters here, like me, who say “I don’t know a single person who was seriously ill with this, let alone died from it.” But for the ones who do claim to know people affected, they seem most often to claim they know multiple people who died and multiple others who were gravely ill. Rarely if ever do you see a story of just one death, or one illness. Interesting.