

Sigh. No, I don’t.
First, I apologize for the insult earlier, it was not constructive nor warraned.
You’ve failed to divine Dahl’s meaning behind the quote from The Twits. Or more likely I’ve failed to explain it in way that saticfies your needs (which is on me, not you).
Dahl’s point, which I generally agree with, is that a person’s demeanour is shown on their face by their expressions. A person with an ‘ugly’ demeanor probably has ‘ugly’ expressions.
Dahl’s point is that your expressions convey information and he draws a distinction between having ‘bad’ features versus having ‘bad’ expressions.
In the vast and complex field of neurodivergence that generalisation can fall apart when one’s expressions no longer convey information about your thoughts.

I agree.
One has to take it in context. Particularly when we simultaneously say “don’t judge a book by it’s cover” (despite that literally being the point of a book’s cover in a bookstore).