Bitcoin had been closing in on $10,000, but it fell almost 6% Sunday and was down another 2% Monday to just over $9,300.
"I agree I would short it if there was an easy way to do it", he stated.
Before the Berkshire annual meeting on Saturday, Buffett told CNBC that bitcoin was "probably rat poison squared".
Buffett, 87, and his longtime partner and fellow billionaire Charlie Munger, 94, also took pointed questions on China, Wells Fargo & Co, guns, healthcare and their investment choices from shareholders, journalists and analysts at the more-than-six-hour meeting in Omaha, Nebraska.
I like cryptocurrency even less than Warren does.to me it's just dementia. Quoting Buffett, the Reuters report suggested that the billionaire was not at all fond of Bitcoins. It's like somebody else is trading turds and you decide you can't be left out. Buffett said investors would instead be much better off investing in USA stocks, which in turn are also a far better investment than 10- or 30-year U.S. government bonds.
He has previously referred to bitcoin as a bubble and not an investment.
Robust phrases. However to be truthful to bitcoin bulls, each Buffett and Munger have been mistaken concerning the cryptocurrency.
Buffett has also sworn that he will never buy cryptocurrencies, saying he does not understand the asset.
He said investors now are much better off owning USA stocks, whose prices are elevated but not in a "bubble", and it would take a "nanosecond" for him to choose stocks over 10- or 30-year US government bonds now yielding around 3 percent.
The Microsoft founder considers digital currencies to be too risky for long-term commitments for private investors as well as for institutional ones.