I've read "quite a few books" in my lifetime. I am not interested in having a conversation about any of them. Well... maybe one or two. Love Tolkien but boy did he need an editor. For the most part, many of the books I read are instantly forgettable. Those that aren't, I remember fragments, some bright, salient details surrounded by a fog of dullness.
I watched John Carter the movie with my wife a while back, I know I read the books and shorts many years ago, I couldn't tell you anything about them other than "civil war era soldier" (I think), goes to Mars, does some stuff, saves the day, gets the girl (sort of). All I could think, after having read the Princess of Mars story was about were the plot holes for a few days post-reading. Ripping yarns. And then, after years, utterly forgotten. There was a few parts in the movie where I thought "Oh, I remember that from the book" and other scenes I thought "was that in the book." I have no desire to go find out. For all I know I could be confounding the John Carter stories with Danny Dunn.
I keep a spreadsheet of all the books I've read or started to read. Date started, date completed. There's more started dates than completed dates. Any initial thoughts. Sometimes some updated thoughts a little while later. Whenever one of the books comes up in conversation, I get this uneasy, vague recollection that I might have read that. I usually have to check my list. People want to show off how clever they are by quoting bits of it, or dissecting the story - either they read and re-read books for a living, or they don't read very many books, I can't decide which it is.
If someone were to question my knowledge on a book I claim to have read, I'd look incredibly suspicious. I've found, of the people who have tried this gambit, that it is usually someone trying to engage in a pissing contest and I'm not interested in engaging in that. It also makes tops of your shoes dirty.
P.S. Essayist is a) gatekeeping b) showing off his "I read books" Scout badge c) needs a damn editor.