Of course they were bigoted to other white people too, that's out of the question. What I'm trying to say is, it doesn't matter what you take as an example of 'the other' and 'powers that be'. The Powers that be always want to keep their power and keep the others disenfrachised, by any means neccessary. Especially in Marvel comics there have been lots and lots of examples for that, we already named several of them.
In this story's case it's about black people and to a lesser extend the people in the GRC camps (a stand in for refugees, I'd wager) and how they deal with the powers holding them down. Some with bitterness, some fighting back, some trying to change the system from within.
And yea, once you bring in mutants, they are the example for people being disenfranchised, that's what I was saying. And all of those stories are stories about misogynists and their -isms, be they racism, sexism or whatever. Discrimination. They took one example that is rooted in the times the viewership can relate to and which is hotly debated at the moment anyways, but of course it's always about the same thing, no matter which marginalized group you choose to highlight.
As I said, I don't know why it's any different with this story than with all the other stories.
Or maybe it wasn't actually different, because when Captain America was punching Hitler, people freaked out too.^^