I think that as we get older, some of us become set in our ways. Accepting your Bitcoin would mean that he had to figure out an entirely new way of using money. Maybe he has a big ego and doesn’t want to feel lesser by learning the ropes. Maybe he’s contented with where he is and has little interest in acquiring more. God knows.

Maybe you can show him our responses and see how he reacts. Sometimes we need a nudge from the back from complete strangers - entirely new stimulus jolts our senses