prop. AZ law banning colleges from discussing Social Justice

"Social justice is defined as "... promoting a just society by challenging injustice and valuing diversity." It exists when "all people share a common humanity and therefore have a right to equitable treatment, support for their human rights, and a fair allocation of community resources."

I was reading the bill and as noted in the title the term "social justice" was used more than once like below.

"Shall not include in its program of instruction any courses or classes events...

That promote division, resentment, or social justice toward a race, gender etc.

So I looked up the definition of "social justice".  

So how is that a good thing to not be allowed to have classes on social justice or events about social justice?

I understand banning classes that create "division" and "resentment".  But how did "social justice" get thrown in with these two words and their sentiment?

College campus' (well students actually) shut that down years ago.