That's hardly news.
But you're looking in the wrong place.
It was called the "Vienna Declaration and Programme of Action" it was not an agreement to be ratified, but a course of action for the UN members to follow, which includes the US.
Of course in United States social justice is seen as a political stance, it's not surprising from the country that has signed and not ratified
- Convention on the Elimination of All Forms of Discrimination against Women
- International Covenant on Economic, Social and Cultural Rights
- Convention on the Rights of the Child (they do not actually think of the children, apparently)
- Convention on the Rights of Persons with Disabilities
I get that the rights of people with disabilities can be a divisive argument, but they also refuted to sign for
- Optional Protocol to the Convention on the Elimination of All Forms of Discrimination against Women
- Optional Protocol to the International Covenant on Civil and Political Rights
- Optional Protocol to the International Covenant on Economic, Social and Cultural Rights
- Optional Protocol to the Convention against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment
and if that wasn't bad enough, they have also not signed
- International Convention on the Protection of the Rights of All Migrant Workers and Members of their Families
- International Convention for the Protection of all Persons from Enforced Disappearance (CIA really loves making people disappear, they couldn't possibly disappoint them)
How is it possible that we call it "the greatest democracy in the World" while they are not even a real Democracy is the "greatest mystery in modern history"
So, yeah, social justice is political only in USA and probably in some South American dictatorship lead by former nazis and militarily installed by yours truly the USA
Not even Putin would say in public that social justice it's the patrimony of a specific Political side, because it would be a (politcal) suicide, even for a guy like Vladimir Putin who recently spoke about it citing Martin Luther King (of course it's all propaganda in his side, but still...), while in the USA, where MLK was born and was killed, his ideas are still considered "agenda" and not "Country's own values".
Again: not surprising, just sad.
> It was ratified by Russia and, somehow, Afghanistan.
to put it mildly, in that list, as you can see, USA is the country that ratified fewer treaties.
Even Iran ratified one treaty more than US.
Actually there is one that did worse: Bhutan, with zero of them.