My wife also thinks that Bitcoin is fake money until I got home with a grocery coming from Bitcoin I traded with the fiat money, I also surprised her when I paid all our bills, from then on he lets me trade buy Bitcoin with our excess money, people will believe that Bitcoin is not fake if they can see that it can buy stuff and pay bills.
Those who do not understand bitcoin needs a proof for them to believe that it is real and not fake as they think. Now it is being even on stores and able to pay bills wherever you are with fast transaction process. Many are being interested when they know that it has more benefits and really worth to invest.