Black people are just like white people, but racial prejudice is still a thing that happens in the real world.
Actually, I’d go so far as to say that having mutant exist in their own, separate world fatally undercuts the prejudice metaphor. In a world with only normal humans and mutants, it makes a lot of sense to treat the people who can shoot lasers out of their eyes, or read minds, or derail trains with a gesture, differently from everyone else. That’s still prejudice, but it’s rational prejudice.
If you have a world with mutants, and aliens, and gods, and science accidents, but only mutants are targeted for special treatment, you have something a lot closer to real world prejudice, where one group of people is treated differently for arbitrary and culturally biased reasons, and not because they actually present a unique threat to society. There’s no rational reason to treat Wolverine any differently than Spider-Man, but the whole point is that prejudice isn’t rational.
This is exactly my point. You’re approaching this from the “all of this weird stuff is the same because it doesn’t exist in the real world” perspective, but that’s not how people in the Marvel universe see things. Magic is a real thing that people know exists, and isn’t terribly uncommon. It’s existed throughout human history. Merlin was a real dude in the Marvel universe. He’s a known historical fact there. People know magic is a thing, and they know that it’s different from being a mutant, because they exist in a culture where these things are common knowledge.
Specifically, people know Dr. Doom isn’t a mutant because he’s a public figure. He’s the ruler of a small but politically significant country, and makes no effort to disguise his identity or history. (The mask isn’t for anonymity, but because of his horrific facial scars.) Anyone in the Marvel universe who reads a newspaper or watches their version of CNN probably knows who Dr. Doom is, and has a rough idea about what his deal is and where he came from.
Hell, canonically, Marvel Comics exists inside of the Marvel universe, and publishes mostly the same books, except they’re technically “true crime” comics because they’re relaying actual events. People in the Marvel universe know who Dr. Doom is the same way people in the real world know who he is: they read the comics.
I… didn’t give a description of bigotry? At least, not in the post you were replying to. But thanks anyway.