Of course he doesn't like bitcoin. He made his fortune as the world's foremost value investor. Why should he change what works for him?
I don't think that there is such things like ''like'' or ''not like'' in investment business.
Investors always looking for the best ways to invest money, and they shouldn't involve their personal feelings in the process.
In business one thing is always true, if you don't change or adapt to the changes, you loose.
It seems that Warren Buffet is to old or to conservative to change and accept ''new things'' or new way of investment.
Everybody has his own style and techniques when it comes to investments. Buffet is a student of Benjamin Graham and has come closer to perfecting Graham's ideas and techniques than anyone else has. Buffet would have to gain a whole new skill-set by researching and educating himself about bitcoin. That's why he doesn't invest in bitcoin, forex, and other markets that are outside his expertise.
Only a fool spreads himself too thin and expects to make a profit, and Buffet is no fool.