I would call that uneducated rather than unintelligent. Not everyone is an expert on Covid-19, most people here aren't. We look for and rely on trusted sources to get our information about it.

But many mainstream trusted sources have been carrying out misinformation/divertion campaigns by focusing prevention on hand hygiene and vaccination, instead of explaining the actual mechanism of transmission. So unless they're curious and proactive about searching for neutral information (which is orthogonal to intelligence), many people by default believe transmission happens by touching surfaces, or cannot happen when one has taken vaccines, for instance.