So for example in this case, the skeptic asserts that the virus is not much worse than the flu. This, despite evidence that basically everyone on earth has seen that this is not the case. (Many people personally know someone who has died of Covid in the last year, despite not ever having known anyone who has died of the flu over the prior decades of their lives.)
Even prominent Covid denialist Trump a) took an experimental antibody treatment and then b) got an early dose of the vaccine after c) spending trillions of taxpayer dollars on Covid relief efforts. If someone like Trump who actually thinks it's the flu also behaves as if it's a serious disease, it makes skeptics like OP here seem much less credible.
What's interesting about the vaccine skepticism on HN is that in any biotech thread, the discussion is around how the FDA is too strict (skeptical) about approving new therapies. But now people suddenly think the FDA is too loose in approving new therapies? The irony is that the FDA is already the skeptic here (see the J&J pause, for example). Occam, again.