Anime only recently took to the mainstream here in Europe and in the West, I'd like to say in the past 10-15 years. And even now not everyone is on board with it as a medium. It is far more popular than it used to be though, and dubs are less likely to "westernise" the culture of the show or game.
I think for a lot of people there's pre-conceived notions about the Japanese, and cartoons from the perspective of an adult. Already it's damned twofold. Hentai is another ball park; it's also porn. Threefold. And it gets pretty whacky and typically has shitty animation. Four.