I think when responding to bad reviews, especially those that are clearly full in inaccuracies and outright errors, it’s probably helpful to write your response (should you want to give one) as a message to other potential customers who are reading the review rather than to the reviewer. So to focus on correcting those facts which are provably wrong, and apologise for anything else. There are often cases where I come across a scathing review but just such a response from the owner makes me feel more confidence in the establishment than in the reviewer! I think you are right though that too many people are letting general frustrations with cost of living increases, lack of salary rises and so much more overwhelm them such that some small negatives (which could have been dealt with at the time) become slightly bizarre rants.