I am going through a similar situation. I wrote a bad review for a family who left the apartment in awful conditions (not just the superficial mess that guests usually leave, but the entire kitchen cabinets were messy and dirty inside, which consumes way more time to clean and organise it back). They were demanding during their stay and did not reciprocate their demands. I wrote a review about it and now the guy is sending me inbox messages saying that I lied, that I have a characer flaw, etc. I have been ignoring him, but I am afraid that if he continues to do so, I'll have to report him to Airbnb and the police!
I would actually like to know about other hosts that have been through situations as such.