Many of the scenes are from the World War II era, when Americans were fighting the Germans and Japanese, so the racism is somewhat understandable. A few are from the ignorant but well-meaning 1960s and 1970s. In a couple of cases I don't agree with the author--such as the X-Men's use of racial slurs to argue against racism.
Racist and stereotypical depictions of Indians make more than their fair share of appearances. Let's take a look:
5 Shockingly Racist Scenes in Famous Superhero Comics
It's unusual for an elite group of whites to be racist, but the Justice League had some problems with it. For starters, even their space aliens were Aryan. When Hanna Barbera adapted them into a cartoon in the '70s, animators had to invent four ethnic members just so they wouldn't burn through their supply of "flesh" paint in the first season. If you're not familiar, the racial heroes added to the Super Friends were:
1. A Native American named Apache Chief who wasn't either of those things.
Superman handled most racial situations perfectly. He made it through WWII and Korea without calling anyone names and he didn't even ask to touch Black Lois' hair. If he had one cultural kryptonite, it was that he wasn't great with Indians.
#4. The X-Men
Like the Justice League, most of the X-Men's cultural diversity came in one explosion of poorly thought out ethnic characters. For example, James Proudstar. He's a Native American with the power of being pretty tough and tracking. Almost as if a racist thought, "What super powers would be handy if you had to, like, be an Indian all day?" And sure enough, when we meet him, he's having a wrestling match with a buffalo. A wrestling match with a buffalo.
Actually, the original Thunderbird was John Proudstar. His brother James became Thunderbird after John died.
And yes, a buffalo on the Apache reservation is fairly ridiculous. It's theoretically possible but extremely unlikely.
Comment: Seanbaby criticizes other portrayals in the Marvel Family comics, but not the Native portrayals. The Native examples are sidelights, and they're self-explanatory.
Unfortunately, it's still not uncommon to see Native characters wearing headdresses and buckskins, or half-naked, or both. Yes, even in the 2010s. For instance, Grant Morrison re-introduced Chief Man-of-Bats, the Native Batman, a few years ago. (Man-of-Bats may have debuted in the Batman story pictured above.)