Because basically we have a bunch of western navel-gazing hipster types taking parts of religions that they have no cultural ties to (such as Shintoism) and no real knowledge of and they will devour, digest and **** it back out and call the mess they made on the floor "Neo-Fascist-Shinto-Hindu-Judaism" and then try to teach member of the the religions that they mashed up and mutilated that somehow they came to the true understanding of that person's religion when all they have done is make a mess on the floor. It is disrespectful to the adherent of those religions and culture to do that. It is cultural appropriation and it is highly disrespectful.
It's both funny and annoying when someone of that ilk starts telling me all about my faith. Mispronouncing words, condescending in tone, getting key concepts messed up, adding other religion's concepts like they were always there, and more. Generally I let it run though one ear and out the other, because when confronted with the ignorance, the most common reaction is defensive and wanting to argue. I'm at the point of 'Why bother?"