Imagine you bought a book with the title How to Talk to A Contemptible Idiot Who Is Kind of Evil. You open the book, and read the author earnestly telling you how important it is that you listen, and show empathy, and acknowledge why the people you’re talking to might believe the things they believe. If you want to persuade them, he says, you need to treat them with respect! But all the way through the book, the author continues to refer to the people he wants to persuade as “contemptible idiots who are kind of evil”.
At one stage he even says: “When speaking to a contemptible idiot who is kind of evil, don’t call them a contemptible idiot who is kind of evil! Many contemptible idiots find that language insulting.” But he continues to do it, and frequently segues into lengthy digressions about how stupid and harmful the idiots’ beliefs are. Presumably you would not feel that the author had really taken his own advice on board
This is very much how I feel about How to Talk to A Science Denier, by the Harvard philosopher Lee McIntyre.