Jeremy Atherton Lin’s “Gay Bar” is a restless and intelligent cultural history of queer nightlife. What if I were to describe a book as plain-spoken or lucid? If you felt a twinge of boredom (bonus if you thrill to disheveled, elusive, gamy), then I have a book for you. I wonder if shared aversions aren’t an even stronger bond. The reason we love people, the writer and interviewer Paul Holdengräber has said, is that we find that we have these favorites in common.