In TVTropes slang, “ghetto” stands for the attitude that a certain content type should stay limited to the narrowly defined pigeonholes that it’s critics made up. For example, the common western attitude that all animation should be made for kids, is the Animation Age Ghetto, or the common expectation that female-targeted shows are strictly for women only, is the Girl Show Ghetto.
These ghettos can even manifest themselves literally as closed-off areas where these stereotypically “inferior” stories can be rounded up and separated from “proper” entertainment, such as libraries sending all manga down to the children’s library, or separating everything all speculative fiction on a sci-fi/fantasy bookshelf, outside of everything else’s alphabetic order.
That latter one, the sci-fi ghetto, gets some of the most interestingly illogical reactions. While by now there are so many mainstream, popular, and even artistically acknowledged sci-fi stories, that you would expect it’s critics to just give up, that’s where prejudice shows it’s stubbornness: Instead of just admitting that, say, 1984 is an intelligent sci-fi novel, therefore sci-fi can be intelligent, the truly prejudiced can still think like this:
“Oh, sci-fi is that silly Star Trek-thing where spaceships shoot lasers at each other, and men wear pajamas, so if 1984 has none of that, it’s not really sci-fi, it’s Proper Literature”
And that’s not even an exaggeration. Critics, and even authors, have really argued that their works are not really fantasy or sci-fi, if they don’t fit into the crudest stereotypes of these genres. Just how arrogant you have to be, to redefine an entire genre according to your own admittedly limited familiarity with it, while dismissing the established definition made by it’s actual audience? As anime fans, you might be directly familiar with that kind of attitude. While most of the above preconceptions are limited to the hilariously ignorant and old-fashioned mainstream, in case of anime, even our fellow fandoms and nerds and enthusiasts, who are protesting the same prejudices themselves, might think and speak like this: