@Laura2592 I'm so sorry to hear you got the brunt of this humiliating and misguided Airbnb initiative. As far as a reply- how about:
" Dear XX- I am so sorry you got this message from Airbnb. Hosts had no input into this scheme whatsoever- in fact, most hosts were very vocal about Airbnb soliciting past guests for contributions on hosts' behalf to be a terrible, cringeworthy idea.
As hosts were not notified by any emails of this, and we were busy moving, we had no idea this was even going on- and that if we didn't "opt-out", that guests would receive these solicitations. (Opt-in was the default).
Please rest assured that we would never solicit our past guests for anything- we appreciate you booking with us and being a good guest- that's all we care about. If you wouldn't mind, please take the time to let Airbnb how offensive you found this email and that they need to make it clear to guests that it is Airbnb who initiated these messages, not the hosts ."