IMO you have the right strategy.

My guess is that his first objection is some variant of "greater fool theory" which is itself a variant of "no inherent value." Essentially, he believes that you only make money on Bitcoin by buying it low and dumping it at a higher price.

To try to move the needle, I might say something like,

"I believe you're thinking about Bitcoin wrong. You are seeing it as an asset, but I am arguing that it is better understood as money." ... and see where the conversation goes from there.