Out of a group or workplace etc, I would only feel comfortable talking to a certain few people. For example, if there were 30 people, I would only feel comfortable talking to about 5 people. Some of them who i dont want to small talk with, don't like it or feel offended when I don't feel like talking to them. Sure, I might smile at them when they look at me. Its not like I completely just ignore them. But why would they think they are entitled to me talking to them?