@Patricia1556 "Airbnb should be helping hosts to expend their energies improving their hosting skills, rather than encouraging them to be preoccupied with and to stress out over fractional ratings."
Airbnb has no interest in helping hosts improve their hosting skills. Their only real interest is in generating bookings so they can collect their service fees. To that end, it doesn't matter if an individual host gets poor ratings, because guests will simply pass on that listing and book another- it doesn't affect Airbnb's bottom line. And if they can keep hosts stressed out about their ratings, hosts become loathe to hold a guest responsible for their bad behavior, in terror of a bad review.
If guests are allowed to be disrespectful with no consequences, that leads to more Airbnb bookings, as those bad guests carry on to book other places and if a host does hold them responsible, or refuse to refund, or whatever might get the guest's knickers in a knot, the guest will be posting on social media about how they'll never book with Airbnb again, how Airbnb always sides with hosts, etc, etc.