I too have had this annoying problem. Unfortunately it does affect our ratings 😞
I have just started and have been having good luck by educating first time bnb'ers in my booking welcome.
"Is this your first airbnb trip? I'd like to explain what you'll get....
You have access to a SHARED bathroom....."
Make sure your end your welcome with
'Would this be OK?"
Many hosts do not accept airbnb'ers with no reviews, because they have had experience with the clueless guest.
But I like first timers - they have that freshness and adventure.
However they need a little more education