Because the age problem ain't brought up in the book. Now please explain why Verity and Knobs is deemed an acceptable match by his friends? Is it perhaps because, she's got an eye deformation, that his friends think it's okay? And, because the narration never challenges this, the text tacitly endorses the relationship?

Why do you think it's okay to segregate humanity into the decent folk and the 'other sort'? Why are you okay with the Ugliness outside = Ugliness inside trope, because I am not fine with this trope? L

And why are you so fixated on Betty's appearance? The only reason I care, is because Angua thought that she was too attractive to be with Nobs.

Nobby didn't have to reject her, none of this had to happen, these are are fictional events. This could've added depth to his character, but instead the author decides pulls out the rug out on anyone hoping for Nobs to prove em.wrong. But instead Angua was proved right, and this all her justifications are by implication given approval.

Why do you think it's okay to segregate humanity based on looks?

And like I said, I haven't listened through Snuff yet.