@Inna22 we have guests like that. My husband calls them "Harry Homeowners" because they are totally concerned about the maintenance of every aspect of our space and convinced they are experts on it. Every creak or quirk gets reported ("did you know the sink in the kitchen occasionally gurgles?") They tend to be retired and I always wonder if they are as preoccupied with the various idiosyncrasies of their own home as they seem to be with mine.
I think these types of guests believe they are being helpful. But they aren't. I feel sorry for any children/friends they may have. This behavior can't be limited to vacation rentals.