[whatshisface]

>opposition to "social justice" signals an opposition to fairness and equality,

That's like a pro-lifer wondering how anyone could be against "life," or a communist wondering why anybody would be against the proletariat, or a capitalist wondering why anybody would be against freedom. You have to go beyond the dictionary definition of the word, and beyond the most abstract and noble stated goals of the movement, to understand why anyone would be against anything.