@Richard531
I have to side with @Elaine701 here.
1. You really don't want those dumb people to book, so if they get scared away by that outlier review, well, that's a win, win. Sure, you might get some who go ahead and book and remember that one review, but well, dumb people often don't bother to read. Once the outlier review is buried under many other great ones, few guests can be bothered to read that far down.
In my experience, none of the negative or less than glowing reviews I have received have ever had any impact on my bookings. Nor have I ever had a guest mention them.
2. Of course, it's never a great idea to write a ranting or personal response to a review, but it can be done effectively. I don't have any examples of my own to give you, but here's a fictional one:
"Unfortunately X and Y did not seem to have read the listing description before their stay. For some reason, they expected to have the entire house to themselves, were astonished that I live here and that I have cats. I would encourage all guests to read the description to ensure it's a good fit and to choose an entire listing rather than booking a private room and expecting the host and other guests to vacate the house!"
I would add that it's a good idea to write responses to the positive reviews, not just the negative ones, so that you aren't unnecessarily highlighting the bad ones.