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Now, then. Here's a question and answer from an AMA, or "Ask Me Anything," thread on an internet forum:
Q. Does [your girlfriend who used to be a miko, or Shinto shrine maiden] have any opinion on all of the cosplayers wearing her sacred vestments to look cute?
A. She doesn't care at all. Also they weren't really "sacred vestments" to her so much as a uniform...like a person at a fill-up station or a convenience store. She kinda likes Touhou, or at least she thinks the characters are cute. [...] She thinks Reimu's outfit is cute, and definitely better than what she had to wear.
-- [WARNING: NSFW / sexist / Reddit link] IAmA guy whose girlfriend was a miko (Shinto "shrine maiden") AMA
Sometimes, I get the feeling that it's the people who shame others for finding meaning in Japanese stories, symbols, and mythology, who are the ones that are actually racist. And possibly ageist, since a lot of the media that portrays these things came to North America in the form of "cartoons," "comic books," and video games, which aren't okay to like because they are "for kids."
Meanwhile, real-world Shinto shrines are actually using their connections to manga and anime to attract visitors. Via Green Shinto, an English-language article in a Japanese newspaper explains:
Some may see it as a trivialisation of sacred space, but priests and anthropologists counter this with such statements as, “Since ancient times, Shinto shrines have not been exclusive. It’s good if they are talked about and become attractive destinations.”
The ema with anime characters on them may strike some readers as weird and merchandise-y. But whatever your feelings about mass media and commercialism, I don't feel like it's a good thing to shame people for liking them. And I feel like when English-speaking people police each other for liking Japanese media, folklore, and/or religion, it doesn't come from a place of respect for those things. It comes from a desire to control, and to punish, and to keep racial boundary lines from being crossed.
Cosplay and other forms of self-expression can be used to give offense and to caricature. But I'm pretty sure that Square-Enix execs aren't offended when people in North America write Final Fantasy fanfic, and the priests at the Fushimi Inari shrine aren't upset about foreign tourists buying ofuda. If they are, they'll just have to console themselves with our money.