I'd call it unhealthy skepticism. Someone who is operating at the level where they might have blindly trusted what the WHO says does not need a push that merely makes them more skeptical of the WHO while remaining hopelessly non-skeptical of all the other manipulators sending narratives their way.
> while remaining hopelessly non-skeptical of all the other manipulators
You insist on assuming based on a one-line comment that the person is a gullible sheeple. And maybe they are, but I fail to see how you have established this.