Hello?
Social justice is the antithesis of "civil rights". When somoene is agitating for the government to steal property from people to throw it at other, favored, political subgroups, that's wrong, immoral, and, oh, by the way, unconstitutional.
Clearly social programs are also unconstitutional. MLK's stance in favor of these collectivist socialist handouts marks him ultimately as an enemy of American freedom.
Discrimination against people on race = bad. BUT, if a private person chooses to conduct his business only with a selected race, that's how he's expressing his freedom in a country that is supposed to be free. Restricting the invidual's freedom violates his civil rights. Period.
That's that. When, however, the government, which has a lawful monopoly on the use of force and the responsibility to act in all the people's interests, the government should not be allowed to discriminate.
The people are one group, the government is another. The Civil Rights laws and the silly notions of "social justice" want to pretend that the people should be constrained by the same rules the government is supposed to be shackled with. And that ain't the case.