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they consider refusing any digital currency, including bitcoin - even if they have a rough understanding of how it works.

Is not about "any digital currency". It is ONLY Bitcoin that matter. All the rest are shitcoins.
My simple answer is always this and I will not spend any more precious time with those losers:
https://m.stacker.news/37875

A longer answer... you will have to listen and give them to watch this:
https://youtu.be/rc_0EcyBSdQ