One of the worst human characteristics is entitlement. People who interact with the world like they are the lone protagonist in everyone’s story. They exist because they are rarely (if ever) confronted.
Make a pledge with me here and now. The next time you see one of these people in public, say something. Tell that guy talking on his phone in the library to shut the fuck up. And when your fellow citizens applaud you, tell them to shut the fuck up too. Quiet in the library.