"Commercial disparagement" is about statements that a person makes, knowing that they are false. The words on the T-shirt are neither true nor false. The T-shirt might be illegal in Singapore because of the word "fuck". In the US, it is totally protected by the First Amendment.
The meta-analysis of all the dockets you propose would be a ginormous project
Even – or especially – taking citations as a Metacritic, this whole idea becomes unwieldy if you go beyond SCOTUS citing itself, for the sheer number of cases you'd have to review in creating it.
Let's take as an example why it works in science: the New Journal of Physics has an ...