Your mum is spot on!

Jack is a pretentious ego-driven layabout who is so wrong brained (oops - I'll be accused of "ableism" again!

) that he imagines that being gifted a load of books actually gives him an identity. It does, I suppose. The identity being "scrounger".
I was listening to this great podcast last night called "what should I read next?" which I'd highly recommend. The podcast host is so laidback and welcoming and recognises why we actually read books - and it is not a competitive sport. James Mustich (who wrote "1000 books to read before you die") was the guest. He talked about why he had written "1000 books" as a way to welcome readers into a book, and encourage them to see that an imposing book, eg "War and Peace", can be met on their own terms.
Meanwhile, in a different part of the forest: Jack opens a big box of books that he has acquired and no doubt will never read, in order to impress on everyone just how clever he actually is. (I'm still not buying it!)