I really don't think I have too much of a problem with "book police." I know what I like to read, and therefore, I am more or less my own "book police." There are certain genres I don't, and won't read, because they are not something I would enjoy. I have had ones who read these genres telling me what a good book it was and insisting I had to read it. But as far as other people reading those genres I really don't care.
I always tell the friends who borrow my books, "I am not your censor, if you start to read a book of mine and don't like it, don't feel you have to finish reading it." I have always been more or less my own person, so don't really care what others think about my reading material.
My daughter and I decided a few years ago, we will read what we want, and not feel it is necessary to share what we are reading with anyone. I do share a lot of what I read for recreation and entertainment this blog and Book Lover's Journal, however, that is for my own benefit, to help me remember what the books are about, and to remember what I read. I found that a few times I have bought the same book a year or two later, forgetting that I had already read it.
How about you, do you have "book police" wrinkling their noses at what you read?