There are a couple of things I would do in this situation, firstly, I would remind your friend that a "Ponzi Scheme" was actually carried out with fiat currency, not crypto currency.
I dont agree with you with this. Ponzi scheme its not always carried with fiat.
Oke i understand that all about fiat because no other currency can be used as ponzi.
But remember, crypto currency can be used as a background of legit company but in the back it can be ponzi.
For example onecoin.
Secondly - some people are just ignorant, if they are not going to get it, its OK. the same people probably have those pulse dial telephones at home and cant figure out why nobody calls them anymore. There are plenty of open minded people in the world, sometimes you have to let a few of the naysayers go.
I agree with this. Why people who dont want to do something and they prefer to talk something bad about that?
If we dont to do it then just dont. Dont need to talk something bad.