One dollar in 2020 is not the same as one dollar in 2024, but you can say the same about one bitcoin. It might be better to use examples of the decrease in purchasing power (how much 'stuff' one dollar used to be able to buy) of one dollar in that four year span and compare that to one bitcoin, which has increased in purchasing power.

Additionally, most people do not really understand that inflation is only caused by an increase in the supply of their local currency. Sure, you can have some price variation based on supply and demand or other reasons, but that is not inflation.

Here are some examples that I like to share with people and it seems to 'click' pretty quickly:

Imagine you have only four people in some economy and each of them have $500. Currently, they each own 25% (500 out of 2000) of the total value in that economy (since money is a representation of value). One of them has the ability to make more of that money, so he creates $2,000 more to give to himself. Now he has $2,500 while everyone else still has $500. Although they still see that $500 in their bank account, they now only own 12.5% of the total value of the economy while the other guy owns 62.5% (2500 of the 4000). By printing money, he stole 37.5% of the total wealth of the economy.

In the example above, let's use a scarce asset. In the same economy, there are four houses in total. Let's say they are each 25% of the total value in this economy because they are the only goods/services available. Since they are scarce, they will hold their value. If there is $2,000 in this economy of four houses, they are all worth $500 each. Now when our friend prints his $2,000 and brings our total to $4,000, the value of the houses still hold at 25%. Now they're worth $1,000 each. They have increased in value because someone increased the money supply. This is inflation (obviously).

Let's say you and I live on an island and I have 1 bitcoin that we agree to use as money. With no goods/services available, the 1 bitcoin is worthless. Now, you start fishing. You catch one fish and I'm willing to trade that bitcoin for it, so 1 fish costs 1 bitcoin. You continue to fish and catch 4 more. Now there are 5 fish and 1 bitcoin. Now, 1 fish costs 0.2 bitcoin. That is deflation (obviously).

These are rudimentary examples and I let them know that, but it often gets the point across.