My "Supervisors" have had a very hard time believing me when I've told them that and last year they kept sending me to the same places over and over until I refused to keep pestering those who refused to participate.
The supervisors get a bonus for completed cases, us "enumerators" do not. What we got were increasingly hostile reactions and I got pretty good at calming folks down by acknowledging their right to refuse and apologizing for pestering them.
Last year my 1st Supervisor decided to ride along with me one day to "show you how it's done" and I welcomed that. He quit a few days later. I have no doubt he was getting flack from his superiors who were sitting in their offices at home.
This year I invited my Supervisor to ride along and he didn't take me up on it. He just quit sending me cases instead.
Aside from that, from the online classes for training to the paperwork needed to get paid, their entire process has been a classic clusterfuck.