I had two clients from America I want offer graphics designing jobs for, I demanded my payment would be in BitcoinBTC or Ethereum. To my greatest dismay, they were dumfounded on what Bitcoin or Ethereum is. I am still suprised up to this very moment. 
Just like the whole world does. Almost majority of people around the world does not have any idea about bitcoin,or even crypto currencies.
So i think you should have let them learn what this is and for when they need to use.
it is your call to lure them inside crypto.