@Linda166 yes, these behaviors are fairly new.
If a guest wants to negotiate the price and you do not want to, then say that your prices are fair. And leave it at that. When guests show up with more than we’re booked, either suggest they attempt to make a request for change via the app, if you can accommodate them all, or refuse entry. If you let them take advantage of you before they are even in the door, then they will keep pushing for more and likely give you a lower review.