I don’t see the difference between a highly educated con man or someone who isn’t exactly a doctor when we talk about his relationship to something like Bitcoin. I am sure that your friend will one day change his mind, especially when he realizes that there are (unfortunately) a lot of scam methods that can be performed with the help of Bitcoin.

People like him have no scruples when it comes to money, they would sell their own mother for profit - so you shouldn't be surprised that he's constantly trying to fool his friends, who, if they were smart, would have rejected such a man a long time ago. I personally would not interact with such people at all, but I would report them (if there is evidence) to the police for any illegal activities.

If you think about it a little better, it’s actually better that he hates Bitcoin than that he’s doing us all a bad reputation with any kind of connection with the same.