There is nothing wrong with issues of social justice and those trying to belittle those values are the ones succeeding by devaluing the term.
You mean like belittling people's opinions because they white? Or by calling people racist because they are concerned about current levels of immigration? Or by calling people sexist for suggesting that men and women don't want the same types of jobs and expecting parity in all jobs is unreasonable? Or for calling people "transphobic" for being appalled at idea of promoting sex change operations to vulnerable teens.
SJWs get the derogatory label because all they do is go around belittling the values of people that disagree with them.
It is ironic that you don't like being fed your own medicine.
A little hint: "justice" is in the eye of the beholder. What you call justice is gross injustice to others.