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The same people who say things about cryptocurrency that it's unknown for them they act like they really know all about the other things what they trust,If you ask from average person can they explain the process of creating money debt and Fiat currency...they don't know.
People know about money, but not many people know how money works, starting from the process and mechanism by which money is printed to how much is printed each year.
People know Bitcoin and often hear the name Bitcoin, but not those who know how it works and other things about Bitcoin.
From not knowing will change to knowing their ignorance about money and Bitcoin. When you know, you can make comparisons about which is good and which is good.
On the other hand, when people say they don't know about Bitcoin, maybe they don't want to explain more clearly what they know about Bitcoin so that other people can't read it.