My bookshelves usually make people dumbstruct, or they used to.
I used ta like the coffee place, Ramone's, in an old home town: good bakery, good coffee, comfortable room with local art put up any which way (gnashes teeth), and, towards the restroom, a shelf of freebee books, which kept changing.. that was the kind of place you could start to chat about books.
Another one, similar idea but cozier, was back on Marine, between Venice and Santa Monica. Places made for book talk.
Alternately, I can be chary about approaching zealots. Reminds me of a greyhound bus ride I took from San Diego to LA. Longest ride ever, while the older woman next me went on and on and on and on about the Lennon Sisters.