It's about them missrepresenting the transaction. If you go to the store and rent a movie then it's an agreement that it's temporary. If you buy it then they can't take it back, what they are doing is fraud and complaining that we don't want to deal with them.

In sure they count as a kind of mushroom.

I think that's intentional. It proves their dominance. I mean you have to go to them and they are wearing something very silly and you have to pretend it's not silly, and if you don't they will harm you somehow.