It's more akin to using the term to unite mutants. In the real world it's more like black people being proud to black. The race classifications had been used to subjugate black people for centuries, used to treat black people as subhuman. But now black is beautiful, black is creative and positive.
I see the new mutant term like that. They didn't come up with the term, but they are going to embrace it and turn it into a positive for their people. So that they will proudly say they are mutants. That's what I mean by embracing it.