@decaf_wizard: It's not really bullshit. Besides the fact like you said it's common, due to the majority of America being white, comic books have typically appealed to a certain demographic. (The fact that for the majority of comic book history superheroes have been white) Black people will watch comic book movies and you'll even see a few black posters on here but that doesn't change the general standard.
Hell I'm pretty sure Black Panther broke the record in terms of the number of black people who came to see it in terms of Marvel movies.
That's why in recent times we've seen a lot of website or hubs started by black people who are fans of comics, anime, etc. Because they're a minority in the black community.