Depends on the person. Generally I use the analogy of gold, and how money used to represent the energy to produce gold (i.e. the labor involved in gold mining). I explain to them that once this link was fully severed in 1971, those close to the fiat printing press have accumulated wealth at the expense of those furthest away from it. Bitcoin is not just created by pressing a button, as todays currencies are, but are created through energy, and one needs to show they have “worked” to mine it or they have had to pay someone else to get it. I also explain that bitcoin is superior to gold backed money as there, unlike gold, is a verifiable supply of it and it can be passed censorship free without permission to anyone in the world with an internet connection virtually cost less and which clears in just a few minutes.

Most of my friends are in their 40s and 50s and they only know the world of fiat. It is hard to change their minds as our brains get less plastic as one gets older. But this explanation often works.