Emasculation means it takes away the manhood of something, or a better interpretation might be it dehumanizes people by making them children (non-adults).  In other words, people didn't really accomplish anything, they were just given stuff because they belonged to some certain group.

Anyway, though, DEI is not the only type of unfair favortism out there, contrary to what some conservatives may think.  In fact, in a lot of places people are given jobs because they belong to family, because they are rich, because they paid a bribe. Can someone think of more reasons?