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.