LOL. At least when the explanations are that crazy, those saying it are already labelled as whackos and the only people listening are probably already beyond help.
In these cases, I'd rather have people go overboard in social or self-isolation than ignore that. So the preppers and the shut-ins who normally seem a little off have the best strategy. When they say I told you so, I smile, but when they start ranting about the Chinese or American government, I tune it out if they seem serious or join in on the nonsensical speculation and conspriacy if I think they are joking.