Don't get frustrate about their opinion but rather respect it. Maybe they don't know bitcoin yet so understand their situation.
Just continue what you do and stay ow key so that you will not receive any discouraging word from them.
You don't need to feel frustrating when they are against your idea, belief and investment. You are not teachers for them without fee. Why you have to use your time to teach them what they don't believe in and they even call you as a scammer?
Honestly gaining knowledge in Bitcoin market needs time, a lot of time and they even have to pay fee to learn right knowledge at beginning. If you learn something wrongly at beginning, it will be more difficult to correct your knowledge later if what you learned already settles deeply in your brain.
Just show them a result because money can change the personal perspective of people so show them what they miss and for sure they are the one will come to you and ask about how they can also participate with activities using bitcoin.
I disagree. Don't connect Bitcoin with money, profitable stories only.
Even it is more attractive to tell them such stories because human are all greed and will be attracted with things that can help them rich. But if you do this, they will knock your doors and ask why they end with loss from investment or trading with Bitcoin.
You also will put yourself at risk if they know you are rich by bitcoin. They might observe you and steal your bitcoin or kidnap you. Do you want this? Personally I don't want such troubles.