Egalitarianism is for people who think the past has no bearing on the present, who can’t fathom why social justice movements might be more focused on one subset of people than another, and who get their feelings hurt at the implication that they might have some kind of privilege. It’s for people who think we live in a socio-cultural vacuum.
To put differently, it’s the perfect word for anti-woman, homophobic, transphobic racists to latch onto while pretending to be progressive.