If I value 1 BTC at one hand job, but you value it at ten, how do we settle it?
Dollars don't solve that problem either. I might value 1 handjob at $10 but another person might think it's worth $100. This problem is more about subjective value than the currency you're using.
You can hate dollars all you want. You need some way of measuring buying power, which is the point of any cash, and the dollar is the most convenient way of doing that.
To be fair, I think he's talking about an alternate universe where Bitcoin is actually widely used as a currency.
Bitcoin
could be used to measure buying power just as easily as dollars. It's just so seldom used as a currency that merchants and businesses have no reason to price their wares in BTC and consumers have no reason to measure their wealth in it. Everyone references dollars because that's the most relevant reserve currency.
It's weird the amount of people who only save in fiat. Right now there's a universe of options to attempt to protect your buying power. Very few seem to pursue it.
Very few people understand on a fundamental level how our economy works and how much money is being printed. That's the greatest advantage that governments have: people assume macroeconomics is a matter for the experts, not the plebs. They just aren't paying attention.