(I am focusing on the U.S; but posts about other countries are nice.)
Feminism is a social movement that got popular in the previous century; it is a movement that promotes gender equality?
Racial egalitarianism also got popular in the previous century; people were fed up with racial discrimination.
I think egalitarian movements could have easily became popular during this time; egalitarianism promotes the idea that all humans are equal, which is what most civil rights movements focused on; so how did explicitly-stated egalitarian movements manage to not get popular?
Egalitarian movements are plenty popular, so the answer you’re looking for lies in the names.
To start with - let’s look at the Syllable count:
So this isn’t catchy.
Next up, the Gender Egalitarian side was a title used for a lot of whataboutism. Once a movement’s associated with bad actors, it’ll have a hard time gaining traction, so we have the jimbo problem.