"But some of it isn't fine"
There's an objection that comes from the honest end of the reader, and I want to take it seriously. Some of what you notice really is wrong. The pan does need washing. The total is wrong. If the book is asking you to say thanks instead, then it's asking you to pretend, and you won't.
It isn't asking that. You don't thank the pan. Nothing in this book requires you to say a wrong total is right or to smile at a thing that needs fixing. The fault list stays. What the book asks is that you keep two lists rather than one.
The first list is faults, and it goes on being a list of faults. Later, in chapter 20, I'll suggest running it through a couple of questions before you read it out, but nothing on it gets renamed. The second list is what's fine, and until now it hasn't existed. That's the change. Not a swap, an addition.
I think the pretending objection comes from imagining that the two lists compete, so that saying thanks for the table somehow costs you the right to mention the pan. It doesn't. You can say "thanks for doing the table" when you walk in, and "the pan's still there" ten minutes later, and both are true. What changes is that your partner hears two true things instead of one, and the two together are a fair report of the evening, which the one wasn't.
If anything, the second list makes the first more usable. A fault mentioned by someone who also mentions the fine is heard as information. The same fault from someone who only ever mentions faults is heard as the weather, and people stop listening to weather. If you want the wrong total taken seriously, the forty right pages are your best route to it.
So keep your honesty. It's the thing that makes you worth listening to. Just apply it to the whole room.