The "tribute/parody" movie that you keep mentioning isn't a thing. There have been, maybe 2 movies like that made in the last 20 years, so it's not a genre onto itself, and with all due respect, your belief that every kids' movie is going to turn out this way is just a tad paranoid and unfounded. If your interpretation of a movie that can be enjoyed by both children and adults in equal measure is "parent service" (which isn't even a thing, btw. You made that up), then naturally, you're going to assume that any and every movie that succeeds on more than one level is being made for "anti-fans". Using your logic, Marvel's The Avengers was a "movie aimed at adults at the rest of the family's expense" because it was enjoyed equally by adults and by children. But here's the thing: fans don't have to prove to you, me or anyone else that they are fans. Anyone who considers themselves to be a Barbie fan is going to go see this movie, and anyone who doesn't consider his/herself to be a Barbie fan isn't going to bother with it. That's the long and the short of it. Whether or not these movie goers meet one's personal standards on what a fan is or should be is irrelevant, as previously stated. It should only matter if these movie goers pay to see the movie in theaters, which is how box office success is defined.
Am I saying that I think the Barbie movie will be perfect? No. But I at least believe that Mattel has some idea what to do with this project. seeing as how the company has has several successful doll lines and has produced home videos which seem to be selling (they keep making them, someone must be buying them!) and a web series which is currently in it's 4th season (I believe), so I'm cautiously optimistic that it will turn out well as opposed to merely assuming that any and every kids project is going to turn out badly before learning anything about it. Given that, there's no reason for someone like you to go see or even learn any more about the movie, since you've already convinced yourself that it's going to be bad and that said movie doesn't meet your (very) specific standards of what a kids' movie should be.