It is difficult to convince people into jumping in to Bitcoin. There are many people that are too narrow-minded when in comes to this type of conversation. No matter what you tell them, they will insist on what they know regardless even if it is wrong or not. As soon as you explained them the concept of Bitcoin, that should be enough. Sooner or later, they will come to you and ask more about Bitcoin. This might happen since Bitcoin is gaining more and more popularity.