Speaking as a former landlord, most renters are assholes, not all, but most. They tear up your property, complain about stuff that they would never fix if they owned it, and in the end fail to ever pay on time. Once every few years you get a good one, but then they only ever seem to stay a few months to a year, and then its back to the same old.
And to be honest, I have been reading this since the start, and I’m not sure that I disagree with the landlord. I agree that he should have done this more timely, but have you ever tried to manage multiple properties, get a cleaning crew to show up for work, get a carpet company in to replace carpet, and do it all within 30 days?