Removing a stigma from something that has been heavily influenced by the media as a 'scam' can be significantly difficult especially if you are dealing with people who are ignorant of listening to the facts.

One of the ways in order to at least convince them that bitcoin is not a scam is through showing your actual earnings. Show results by showing them the process of earning and the actual fruits of your income through your investments. Another way is to educate them and introduce this forum. I know lots of people who firstly doubt cryptocurrencies but the irony is, they are now members of this forum!