Yep, there are lying, scamming, or overly fussy hosts, just as there are guests. If I see a bad review, for either a host or a guest, I cross reference to see if that person has a history of leaving those kinds of reviews. As long as there are an ample number of reviews to get an idea, you can usually tell who is telling the truth.
A host who has upwards of 40 reviews and has reviewed all but one guest nicely isn’t likely to be making anything up or exaggerating.
I had a lovely guest who told me she got a bad review from a host who complained that the guest overused the kitchen. Yet the host advertised full kitchen use without restrictions. My guest said “Why didn’t she just say something at the time? If she felt I was in the kitchen too much, and wanted me to only use it at certain times, I would have respected that. Instead she slammed me in the review.”
I think some hosts, particularly home-share hosts, refrain from just straightforwardly telling guests if they are doing something annoying, either because they shy away from confronting things head-on or are terrified of a bad review, then trash the guest in the review, which to me is really unfair to the guest and cowardly.
If hosts want to be given the opportunity to correct something the guest finds amiss, they have to be willing to afford guests the same respect.