You might not be put off by a negative review written by a host to a sitter amidst a previously unmarred 5 star review history, but others certainly are. See this post, which is typical of others I’ve read (from another thread:)
It naturally follows that the sitter will respond defensively to a host’s negative review and then it’s a matter of a potential sitter having to try to determine what really happened, or just shrugging their shoulders and moving on to the next listing rather than risking an unreasonable and picky host.