If Jesus is not preaching social justice, what is he preaching? Believing Christians have a responsibility to those in need is not Marxism, and many evangelicals are as committed to a social justice theology as are Lutherans, Catholics, etc.
In the sense that we, as individuals should behave justly, perhaps. "Social Justice" however, has come to mean the forcable redistribution of wealth. Maybe the FR New Testament scholars can tell us if Jesus preached that.
Conservatives, both political and religious, believe this is not Virtue, but stealing, and that true social justice involves Charity, comprised of freely giving in love.