From the U.S. copyright office: “Section 107 contains a list of the various purposes for which the reproduction of a particular work may be considered ‘fair,’ such as criticism, comment, news reporting, teaching, scholarship, and research.
“Section 107 also sets out four factors to be considered in determining whether or not a particular use is fair: 1. the purpose and character of the use, including whether such use is of commercial nature or is for nonprofit educational purposes; 2. the nature of the copyrighted work; 3. amount and substantiality of the portion used in relation to the copyrighted work as a whole; and 4. the effect of the use upon the potential market for or value of the copyrighted work.”
Spocko was clearly using the Disney segment for the purposes of criticsm, comment, and news reporting.
The use was clearly not for commercial purposes, and equally clearly was for educational purposes.
He used only excerpts, and did not post “the copyrighted work as a whole.”
The use had no effect upon the potential market value of the copyrighted work. Indeed, the nature of the news business is such that the market value of the work was non-existent by the time Spocko made his post. (It may have had an effect on the market value of KSFO's future output, but that's a separate issue.)
In other words, it is difficult to imagine a more clear-cut case of fair use.