I did some analysis and have come to understand that majority of us are afraid to tell people about bitcoin because people see it as a scam and maybe, it could implicate us. But then, I think I know a good way you can convince them that bitcoin isn't scam.
Majority of the common people don't see bitcoin as a scam. I am saying this from my personal experience because I have spoken to a number of people regarding bitcoin. Definitely the outlook varies from places to places, but I have seen people consider it as illegal in my country, rather than a scam. This situation is very difficult to change because of its legal status in many countries!
In majority of the countries, bitcoin doesn't have a legal status! It is either banned from government or banned from banking channel. Which certainly creates a misconception about bitcoin in the minds of the people. We all need to fight against that misconception firstly to make people understand about bitcoin.