One of my friends does this all the time. She will take everything I say, literally.
For example, we were in my garage (new place, so was showing her around) I explained that it'd be a good space, once I got rid of the cellar spiders that have taken over. She genuinely looked puzzled, and said... "cellar spiders? But this is a garage, shouldn't they be in the cellar?!!"
I was so taken aback, I just laughed it off
but she was being serious 🙈 I mean how do you respond to people like this?!