Never assumed you did :), but yes, as little assumptions is the best. But as you can already tell, it’s hard to communicate when you take no assumptions when people make explicit statements crafted to dispel assumptions, that are entirely plausible for a hypothetical real person to have.

In fact, your original statement of “They have no doubts. Never occurred to them it might be a joke…”, is in itself a pretty big assumption. Unless, of course. I assume that statement to be a hyperbole, or even satire. But if we want to have fun talking about a shitpost we do kind of have to take an assumptive position on the meme that can’t talk back.