Two-thirds of Brits have lied about reading books they haven’t. Have you? Why? What book?
You asked why, but I will tell you why not.
I think there is no need to lie. If I didn't read a book I don't think it is a big deal. If I want to read it in the future, I will, if not, I won't. I've told people the truth, I've started books and never finished. Among those were Bleak House & Crime and Punishment. If they ask why, I'll tell them either I got bored or didn't feel like it.
I've read plenty of good books, and so what if I didn't read some of the more 'important' books of the day.
Does anyone really care? I don't read to impress, I read for enjoyment, and if someone wants to judge me because I didn't read XYZ, then I think they need a hobby. LOL!