I was questioned on crypto currencies legalization. I explained the facts happening around. Few received it with convincing reactions and few just ignored it. I really felt bad for the guys who did not care about crypto currencies as I really know the fruitfulness? I happily taught few others about crypto currencies. What was your friends expression when you introduced bitcoin to them?
If they haven't heard of it, tell them. If they don't understand it, explain them. If they are not willing to learn more about it, leave them alone. Lol.
That's their loss.