Actually, grassroots LGBTQ, anti-racist/anti-oppression and pro-choice activists- not the ones at the D.C. level, the ones who still think grassroots work matters- are very much in support of economic justice issues of the type Bernie Sanders talked about.
Bernie shouldn't run for president again, but there need to be candidates who reject the establishment Democratic idea that there is an unbridgeable gulf between their watered-down version of "social justice" and the economic justice agenda- that the two agendas go together, since people facing social oppression are usually facing economic oppression as well, and since there are hardly any of them whose problems would vanish if only sufficient anti-discrimination and equity laws were passed.